Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

45 files changed, 1323 insertions, 0 deletions

diff --git a/testing/web-platform/tests/svg/path/bearing/absolute-ref.svg b/testing/web-platform/tests/svg/path/bearing/absolute-ref.svg
new file mode 100644
index 0000000000..85b20271a1
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/absolute-ref.svg
@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 20 150 v -120 h 140 v 120 z" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/bearing/absolute.svg b/testing/web-platform/tests/svg/path/bearing/absolute.svg
new file mode 100644
index 0000000000..0efc295f31
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/absolute.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
+  <metadata>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/svg-paths/#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/SVG2/paths.html#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://svgwg.org/svg2-draft/changes.html#paths"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="match" href="absolute-ref.svg"/>
+    <meta xmlns="http://www.w3.org/1999/xhtml" name="assert" content="path element with B commands renders correctly."/>
+  </metadata>
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 20 150 B -90 h 120 B 0 h 140 B 90 h 120 z" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/bearing/relative-ref.svg b/testing/web-platform/tests/svg/path/bearing/relative-ref.svg
new file mode 100644
index 0000000000..85b20271a1
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/relative-ref.svg
@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 20 150 v -120 h 140 v 120 z" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/bearing/relative.svg b/testing/web-platform/tests/svg/path/bearing/relative.svg
new file mode 100644
index 0000000000..75b87ff8ac
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/relative.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200">
+  <metadata>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/svg-paths/#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/SVG2/paths.html#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://svgwg.org/svg2-draft/changes.html#paths"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="match" href="absolute-ref.svg"/>
+    <meta xmlns="http://www.w3.org/1999/xhtml" name="assert" content="path element with b commands renders correctly."/>
+  </metadata>
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 20 150 b -90 h 120 b 90 h 140 b 90 h 120 z" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/bearing/zero-ref.svg b/testing/web-platform/tests/svg/path/bearing/zero-ref.svg
new file mode 100644
index 0000000000..3558de3153
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/zero-ref.svg
@@ -0,0 +1,9 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 25 50 h 10 m 10 0 h 10 m 10 0 h 10" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/bearing/zero.svg b/testing/web-platform/tests/svg/path/bearing/zero.svg
new file mode 100644
index 0000000000..80256429b6
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/bearing/zero.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+  <metadata>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/svg-paths/#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://www.w3.org/TR/SVG2/paths.html#PathDataBearingCommands"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="help" href="https://svgwg.org/svg2-draft/changes.html#paths"/>
+    <link xmlns="http://www.w3.org/1999/xhtml" rel="match" href="zero-ref.svg"/>
+    <meta xmlns="http://www.w3.org/1999/xhtml" name="assert" content="path element with bearing 0 renders correctly."/>
+  </metadata>
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 25 50 h 10 B 0 m 10 0 h 10 b 0 m 10 0 h 10" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/closepath/segment-completing-ref.svg b/testing/web-platform/tests/svg/path/closepath/segment-completing-ref.svg
new file mode 100644
index 0000000000..cc068cefe3
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/closepath/segment-completing-ref.svg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="300" height="200">
+  <style>
+    path {
+      stroke: blue;
+    }
+  </style>
+  <path d="M 10 10 z m 20 70 h 10 v 10 h -10 l 0 -10 M 70 30 q 20 0 20 20 t -20 20 t -20 -20 T 70 30" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/closepath/segment-completing.svg b/testing/web-platform/tests/svg/path/closepath/segment-completing.svg
new file mode 100644
index 0000000000..5b72c494b3
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/closepath/segment-completing.svg
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     width="300" height="200">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#paths-PathDataClosePathCommand"/>
+    <h:link rel="match" href="segment-completing-ref.svg"/>
+    <h:meta name="assert" content="initial subpath point used to complete segment."/>
+  </metadata>
+  <style>
+    path {
+      stroke: blue;
+    }
+  </style>
+  <path d="M 10 10 z m 20 70 h 10 v 10 h -10 l z M 70 30 q 20 0 20 20 t -20 20 t -20 -20 T z" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-positive-percentage.svg b/testing/web-platform/tests/svg/path/distance/pathLength-positive-percentage.svg
new file mode 100644
index 0000000000..d8e28b0889
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-positive-percentage.svg
@@ -0,0 +1,36 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200"
+     font-family="sans-serif" font-size="28">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+    <h:link rel="match" href="pathLength-positive-ref.svg"/>
+    <h:meta name="assert" content="pathLength scales distance along the path"/>
+  </metadata>
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none" d="M 50 50 h 200" pathLength="2"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="0%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="50%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="-50%">The quick brown fox</textPath>
+    </text>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-positive-ref.svg b/testing/web-platform/tests/svg/path/distance/pathLength-positive-ref.svg
new file mode 100644
index 0000000000..9a9a1a8d47
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-positive-ref.svg
@@ -0,0 +1,32 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200">
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none"
+    d="M 50 50 h 200"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="0%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="50%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="-50%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+</svg>
+
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-positive.svg b/testing/web-platform/tests/svg/path/distance/pathLength-positive.svg
new file mode 100644
index 0000000000..798b7ff3b8
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-positive.svg
@@ -0,0 +1,38 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200">
+
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+    <h:link rel="match" href="pathLength-positive-ref.svg"/>
+    <h:meta name="assert" content="pathLength scales distance along the path"/>
+  </metadata>
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none" d="M 50 50 h 200" pathLength="2"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="0">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="1">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="-1">The quick brown fox</textPath>
+    </text>
+  </g>
+
+</svg>
+
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage-ref.svg b/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage-ref.svg
new file mode 100644
index 0000000000..dca91c1b5f
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage-ref.svg
@@ -0,0 +1,30 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200"
+     font-family="sans-serif" font-size="28">
+  <defs>
+    <path id="track" stroke="lightblue" fill="none" d="M 50 50 h 200"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track">The quick brown fox</textPath>
+    </text>
+  </g>
+</svg>
+
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage.svg b/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage.svg
new file mode 100644
index 0000000000..24213e443d
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-zero-percentage.svg
@@ -0,0 +1,36 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200"
+     font-family="sans-serif" font-size="28">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+    <h:link rel="match" href="pathLength-zero-percentage-ref.svg"/>
+    <h:meta name="assert" content="A value of zero is valid and must be treated as a scaling factor of infinity."/>
+  </metadata>
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none" d="M 50 50 h 200" pathLength="0"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="0%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="50%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text>
+      <textPath xlink:href="#track" startOffset="-50%">The quick brown fox</textPath>
+    </text>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-zero-ref.svg b/testing/web-platform/tests/svg/path/distance/pathLength-zero-ref.svg
new file mode 100644
index 0000000000..d5556add66
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-zero-ref.svg
@@ -0,0 +1,26 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200">
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none"
+    d="M 50 50 h 200"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="0%">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+  </g>
+
+</svg>
+
diff --git a/testing/web-platform/tests/svg/path/distance/pathLength-zero.svg b/testing/web-platform/tests/svg/path/distance/pathLength-zero.svg
new file mode 100644
index 0000000000..4ae0b836f7
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathLength-zero.svg
@@ -0,0 +1,39 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="300" height="200" viewBox="0 0 300 200">
+
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+    <h:link rel="match" href="pathLength-zero-ref.svg"/>
+    <h:meta name="assert" content="A value of zero is valid and must be treated as a scaling factor of infinity."/>
+  </metadata>
+
+  <defs>
+    <path id="track" stroke="lightblue" fill="none"
+    d="M 50 50 h 200" pathLength="0"/>
+  </defs>
+
+  <g>
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="0">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,50)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="1">The quick brown fox</textPath>
+    </text>
+  </g>
+
+  <g transform="translate(0,100)">
+    <use xlink:href="#track"/>
+    <text font-family="sans-serif" font-size="28">
+      <textPath xlink:href="#track" startOffset="-1">The quick brown fox</textPath>
+    </text>
+  </g>
+
+</svg>
+
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-circle-mutating.svg b/testing/web-platform/tests/svg/path/distance/pathlength-circle-mutating.svg
new file mode 100644
index 0000000000..a033962e6a
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-circle-mutating.svg
@@ -0,0 +1,16 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml" class="reftest-wait"
+     width="100" height="100">
+  <title>Mutating the 'pathLength' attribute ('circle' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="../../linking/reftests/reference/green-100x100.svg"/>
+  <circle cx="100" cy="50" r="100" fill="red" pathLength="6400"
+          stroke="green" stroke-width="200" stroke-dasharray="200"/>
+  <script>
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        document.querySelector('circle').setAttribute('pathLength', 200);
+        document.documentElement.classList.toggle("reftest-wait");
+      });
+    });
+  </script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-path-mutating.svg b/testing/web-platform/tests/svg/path/distance/pathlength-path-mutating.svg
new file mode 100644
index 0000000000..b3f71653f4
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-path-mutating.svg
@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml" class="reftest-wait">
+  <title>Mutating the 'pathLength' attribute ('path' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-path-mutating-ref.svg"/>
+  <path pathLength="800" d="M100,100h100v100h-100z" fill="none"
+        stroke="blue" stroke-width="20" stroke-dasharray="25"/>
+  <script>
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        document.querySelector('path').setAttribute('pathLength', 200);
+        document.documentElement.classList.toggle("reftest-wait");
+      });
+    });
+  </script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-path-negative.svg b/testing/web-platform/tests/svg/path/distance/pathlength-path-negative.svg
new file mode 100644
index 0000000000..ce782dbef7
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-path-negative.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>The 'pathLength' attribute set to a negative value ('path' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-path-negative-ref.svg"/>
+  <path d="M10,10L110,10L110,110L10,110Z" pathLength="-4" stroke-dashoffset="1" stroke-dasharray="1 1"
+        fill="none" stroke="black" stroke-width="10"></path>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-path-zero.svg b/testing/web-platform/tests/svg/path/distance/pathlength-path-zero.svg
new file mode 100644
index 0000000000..f5c4168cd5
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-path-zero.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>The 'pathLength' attribute set to zero ('path' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-path-zero-ref.svg"/>
+  <path d="M10,10L110,10L110,110L10,110Z" pathLength="0" stroke-dashoffset="1" stroke-dasharray="1 1"
+        fill="none" stroke="black" stroke-width="10"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-path.svg b/testing/web-platform/tests/svg/path/distance/pathlength-path.svg
new file mode 100644
index 0000000000..79402505ca
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-path.svg
@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>The 'pathLength' attribute ('path' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-path-ref.svg"/>
+  <path d="M10,10L110,10L110,110L10,110Z" pathLength="4"
+        stroke-dashoffset="1" stroke-dasharray="1 1"
+        fill="none" stroke="black" stroke-width="10"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-rect-mutating.svg b/testing/web-platform/tests/svg/path/distance/pathlength-rect-mutating.svg
new file mode 100644
index 0000000000..2dcbe44079
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-rect-mutating.svg
@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml" class="reftest-wait"
+     width="100" height="100">
+  <title>Mutating the 'pathLength' attribute ('rect' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-rect-mutating-ref.svg"/>
+  <rect y="50" width="200" height="100" fill="red"
+        stroke="green" stroke-width="100" stroke-dasharray="100"
+        pathLength="4800"/>
+  <script>
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        document.querySelector('rect').setAttribute('pathLength', 600);
+        document.documentElement.classList.toggle("reftest-wait");
+      });
+    });
+  </script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/pathlength-rect.svg b/testing/web-platform/tests/svg/path/distance/pathlength-rect.svg
new file mode 100644
index 0000000000..106fed5f2e
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/pathlength-rect.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:h="http://www.w3.org/1999/xhtml">
+  <title>The 'pathLength' attribute ('rect' element)</title>
+  <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#PathLengthAttribute"/>
+  <h:link rel="match" href="reference/pathlength-rect-ref.svg"/>
+  <rect width="50" height="50" pathLength="4" fill="blue"
+        stroke-dashoffset="1" stroke-dasharray="1 1" stroke="black" stroke-width="10"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-mutating-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-mutating-ref.svg
new file mode 100644
index 0000000000..fe45125f6b
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-mutating-ref.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <title>Mutating the 'pathLength' attribute ('path' element; reference)</title>
+  <path d="M100,100h100v100h-100z" fill="none" stroke="blue"
+        stroke-width="20" stroke-dasharray="50"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-negative-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-negative-ref.svg
new file mode 100644
index 0000000000..c4dfb1b2b5
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-negative-ref.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <title>The 'pathLength' attribute set to a negative value ('path' element; reference)</title>
+  <path d="M10,10L110,10L110,110L10,110Z" stroke-dashoffset="1" stroke-dasharray="1 1"
+        fill="none" stroke="black" stroke-width="10"></path>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-ref.svg
new file mode 100644
index 0000000000..79aca87204
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-ref.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <title>The 'pathLength' attribute ('path' element; reference)</title>
+  <path d="M10,10L110,10L110,110L10,110Z" stroke-dashoffset="100" stroke-dasharray="100 100"
+        fill="none" stroke="black" stroke-width="10"></path>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-zero-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-zero-ref.svg
new file mode 100644
index 0000000000..232bf66cbc
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-path-zero-ref.svg
@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <title>The 'pathLength' attribute set to zero ('path' element; reference)</title>
+  <path d="M10,10L110,10L110,110L10,110Z" fill="none" stroke="black" stroke-width="10"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-mutating-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-mutating-ref.svg
new file mode 100644
index 0000000000..120941444a
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-mutating-ref.svg
@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <rect width="100" height="100" fill="green"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-ref.svg b/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-ref.svg
new file mode 100644
index 0000000000..232178d732
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/distance/reference/pathlength-rect-ref.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg">
+  <title>The 'pathLength' attribute ('rect' element; reference)</title>
+  <rect width="50" height="50" fill="blue"
+        stroke-dashoffset="50" stroke-dasharray="50 50" stroke="black" stroke-width="10"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/error-handling/bounding.svg b/testing/web-platform/tests/svg/path/error-handling/bounding.svg
new file mode 100644
index 0000000000..85c089b25b
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/error-handling/bounding.svg
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#paths-PathDataErrorHandling"/>
+    <h:meta name="assert" content="render up to (but not including) the first error"/>
+  </metadata>
+  <g id="container">
+    <path transform="translate(90,10)" />
+    <path transform="translate(80,20)" d="none" />
+    <path transform="translate(70,30)" d="# invalid" />
+    <path transform="translate(60,40)" d="m 0 0 l 3 -4 z # ignored suffix v 123" />
+    <path transform="translate(50,50)" d="" />
+    <path transform="translate(40,60)" d="m 0 0 l -9 11 -123 z # ignore last l parameter" />
+    <polygon transform="translate(20,80)" />
+    <polyline transform="translate(10,90)" />
+  </g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+  test(function() {
+    var container = document.getElementById('container');
+    var bbox = container.getBBox();
+
+    // The rendered paths are "m 0 0 l 3 -4 z" and "m 0 0 l -9 11"
+    assert_equals(bbox.x, 31);
+    assert_equals(bbox.y, 36);
+
+    assert_equals(bbox.width, 32);
+    assert_equals(bbox.height, 35);
+  });
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/error-handling/render-until-error-ref.svg b/testing/web-platform/tests/svg/path/error-handling/render-until-error-ref.svg
new file mode 100644
index 0000000000..dd2d7c32a6
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/error-handling/render-until-error-ref.svg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     width="100" height="100">
+  <style>
+    path {
+      stroke: lime;
+    }
+  </style>
+  <g id="container">
+    <path transform="translate(60,40)" d="m 0 0 l 3 -4 z" />
+    <path transform="translate(40,60)" d="m 0 0 l -9 11" />
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/error-handling/render-until-error.svg b/testing/web-platform/tests/svg/path/error-handling/render-until-error.svg
new file mode 100644
index 0000000000..6b8a50b4f2
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/error-handling/render-until-error.svg
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml"
+     width="100" height="100">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#paths-PathDataErrorHandling"/>
+    <h:link rel="match" href="render-until-error-ref.svg"/>
+    <h:meta name="assert" content="render up to (but not including) the first error"/>
+  </metadata>
+  <style>
+    path {
+      stroke: lime;
+    }
+  </style>
+  <g id="container">
+    <path transform="translate(90,10)" />
+    <path transform="translate(80,20)" d="none" />
+    <path transform="translate(70,30)" d="# invalid" />
+    <path transform="translate(60,40)" d="m 0 0 l 3 -4 z # ignored suffix v 123" />
+    <path transform="translate(50,50)" d="" />
+    <path transform="translate(40,60)" d="m 0 0 l -9 11 -123 z # ignore last l parameter" />
+    <polygon transform="translate(20,80)" />
+    <polyline transform="translate(10,90)" />
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/interfaces/SVGAnimatedPathData-removed.svg b/testing/web-platform/tests/svg/path/interfaces/SVGAnimatedPathData-removed.svg
new file mode 100644
index 0000000000..b9e62177cb
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/interfaces/SVGAnimatedPathData-removed.svg
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/single-page.html#changes-paths"/>
+    <h:link rel="help" href="https://www.w3.org/TR/SVG11/paths.html#InterfaceSVGAnimatedPathData"/>
+    <h:meta name="assert" content="SVGAnimatedPathData interface is not supported."/>
+  </metadata>
+  <path id="track" d="m 10 20 h 30"/>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+  test(function() {
+    assert_equals(window.SVGAnimatedPathData, undefined);
+
+    var track = document.getElementById('track');
+    assert_equals(Object.getPrototypeOf(track), SVGPathElement.prototype);
+    assert_equals(track.pathSegList, undefined);
+    assert_equals(track.normalizedPathSegList, undefined);
+    assert_equals(track.animatedPathSegList, undefined);
+    assert_equals(track.animatedNormalizedPathSegList, undefined);
+  });
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/d-interpolation-discrete.svg b/testing/web-platform/tests/svg/path/property/d-interpolation-discrete.svg
new file mode 100644
index 0000000000..5b20a589bb
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/d-interpolation-discrete.svg
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:meta name="assert" content="d falls back to step interpolation when no interpolation is possible."/>
+  </metadata>
+
+  <g id="container"/>
+
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="resources/interpolation-test-common.js"/>
+  <script><![CDATA[
+      'use strict';
+
+      // Distinct number of path segments
+      test_no_interpolation({
+        property: 'd',
+        from: 'path("M 0 0 H 1 H 2")',
+        to: 'path("M 0 0 H 3")'
+      });
+
+      test_no_interpolation({
+        property: 'd',
+        from: 'path("M 1 2 L 3 4 Z")',
+        to: "none"
+      });
+
+      // Distinct segment types
+      test_no_interpolation({
+        property: 'd',
+        from: 'path("M 10 0 H 11")',
+        to: 'path("M 20 0 V 2")'
+      });
+
+      test_no_interpolation({
+        property: 'd',
+        from: 'path("M 1 2 L 4 6 Z")',
+        to: 'path("M 1 2 H 4 V 6")'
+      });
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/d-interpolation-relative-absolute.svg b/testing/web-platform/tests/svg/path/property/d-interpolation-relative-absolute.svg
new file mode 100644
index 0000000000..09d4c70712
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/d-interpolation-relative-absolute.svg
@@ -0,0 +1,122 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:meta name="assert" content="d can interpolate between absolute and relative paths."/>
+  </metadata>
+
+  <g id="container"/>
+
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="resources/interpolation-test-common.js"/>
+  <script><![CDATA[
+      'use strict';
+
+      // Mix relative and non-relative
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")',
+        to: 'path("M 0 0 L 100 100 m 0 100 l 100 0 z l 300 100 z")'
+      }, [
+        {at: -1, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 0 -100 Z")'},
+        {at: 0, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 0.125, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 225 125 Z")'},
+        {at: 0.875, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 375 275 Z")'},
+        {at: 1, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 400 300 Z")'},
+        {at: 2, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 600 500 Z")'},
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")',
+        to: 'path("M 0 0 L 100 100 m 0 100 l 100 0 z l 100 -100 z")'
+      }, [
+        {at: -1, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 0, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 0.125, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 0.875, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 1, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+        {at: 2, expect: 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 200 100 Z")'},
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 l 40 50 z l 40 60 z m 60 70 l 90 60 z t 70 130")',
+        to: 'path("M 210 220 L 170 190 Z L 90 120 Z M 110 130 L 200 230 Z T 220 220")'
+      }, [
+        {at: -1, expect: 'path("M -190 -180 L -70 -50 Z L 10 40 Z M 30 50 L 120 70 Z T 60 220")'},
+        {at: 0, expect: 'path("M 10 20 L 50 70 Z L 50 80 Z M 70 90 L 160 150 Z T 140 220")'},
+        {at: 0.125, expect: 'path("M 35 45 L 65 85 Z L 55 85 Z M 75 95 L 165 160 Z T 150 220")'},
+        {at: 0.875, expect: 'path("M 185 195 L 155 175 Z L 85 115 Z M 105 125 L 195 220 Z T 210 220")'},
+        {at: 1, expect: 'path("M 210 220 L 170 190 Z L 90 120 Z M 110 130 L 200 230 Z T 220 220")'},
+        {at: 2, expect: 'path("M 410 420 L 290 310 Z L 130 160 Z M 150 170 L 240 310 Z T 300 220")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 c 40 50 30 60 80 70 c 120 130 170 140 110 160")',
+        to: 'path("M 130 100 C 130 150 120 160 210 170 C 290 300 340 310 320 330")'
+      }, [
+        {at: -1, expect: 'path("M -110 -60 C -30 -10 -40 0 -30 10 C 130 140 180 150 80 170")'},
+        {at: 0, expect: 'path("M 10 20 C 50 70 40 80 90 90 C 210 220 260 230 200 250")'},
+        {at: 0.125, expect: 'path("M 25 30 C 60 80 50 90 105 100 C 220 230 270 240 215 260")'},
+        {at: 0.875, expect: 'path("M 115 90 C 120 140 110 150 195 160 C 280 290 330 300 305 320")'},
+        {at: 1, expect: 'path("M 130 100 C 130 150 120 160 210 170 C 290 300 340 310 320 330")'},
+        {at: 2, expect: 'path("M 250 180 C 210 230 200 240 330 250 C 370 380 420 390 440 410")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 q 30 60 40 50 q 110 80 90 80")',
+        to: 'path("M 130 100 Q 120 160 130 150 Q 200 150 180 190")'
+      }, [
+        {at: -1, expect: 'path("M -110 -60 Q -40 0 -30 -10 Q 120 150 100 110")'},
+        {at: 0, expect: 'path("M 10 20 Q 40 80 50 70 Q 160 150 140 150")'},
+        {at: 0.125, expect: 'path("M 25 30 Q 50 90 60 80 Q 165 150 145 155")'},
+        {at: 0.875, expect: 'path("M 115 90 Q 110 150 120 140 Q 195 150 175 185")'},
+        {at: 1, expect: 'path("M 130 100 Q 120 160 130 150 Q 200 150 180 190")'},
+        {at: 2, expect: 'path("M 250 180 Q 200 240 210 230 Q 240 150 220 230")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 s 30 60 40 50 s 110 60 90 70")',
+        to: 'path("M 130 140 S 120 160 130 150 S 200 170 140 180")'
+      }, [
+        {at: -1, expect: 'path("M -110 -100 S -40 0 -30 -10 S 120 90 140 100")'},
+        {at: 0, expect: 'path("M 10 20 S 40 80 50 70 S 160 130 140 140")'},
+        {at: 0.125, expect: 'path("M 25 35 S 50 90 60 80 S 165 135 140 145")'},
+        {at: 0.875, expect: 'path("M 115 125 S 110 150 120 140 S 195 165 140 175")'},
+        {at: 1, expect: 'path("M 130 140 S 120 160 130 150 S 200 170 140 180")'},
+        {at: 2, expect: 'path("M 250 260 S 200 240 210 230 S 240 210 140 220")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 h 30 v 60 h 10 v -10 l 110 60 Z")',
+        to: 'path("M 130 140 H 120 V 160 H 130 V 150 L 200 170 Z")'
+      }, [
+        {at: -1, expect: 'path("M -110 -100 H -40 V 0 H -30 V -10 L 120 90 Z")'},
+        {at: 0, expect: 'path("M 10 20 H 40 V 80 H 50 V 70 L 160 130 Z")'},
+        {at: 0.125, expect: 'path("M 25 35 H 50 V 90 H 60 V 80 L 165 135 Z")'},
+        {at: 0.875, expect: 'path("M 115 125 H 110 V 150 H 120 V 140 L 195 165 Z")'},
+        {at: 1, expect: 'path("M 130 140 H 120 V 160 H 130 V 150 L 200 170 Z")'},
+        {at: 2, expect: 'path("M 250 260 H 200 V 240 H 210 V 230 L 240 210 Z")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50")',
+        to: 'path("M 18 12 A 50 100 70 0 1 90 110 A 150 160 70 0 1 70 80")'
+      }, [
+        {at: -1, expect: 'path("M 2 28 A -30 -60 -10 1 0 10 30 A 70 80 -10 1 1 310 160")'},
+        {at: 0, expect: 'path("M 10 20 A 10 20 30 1 0 50 70 A 110 120 30 1 1 190 120")'},
+        {at: 0.125, expect: 'path("M 11 19 A 15 30 35 1 0 55 75 A 115 125 35 1 1 175 115")'},
+        {at: 0.875, expect: 'path("M 17 13 A 45 90 65 0 1 85 105 A 145 155 65 0 1 85 85")'},
+        {at: 1, expect: 'path("M 18 12 A 50 100 70 0 1 90 110 A 150 160 70 0 1 70 80")'},
+        {at: 2, expect: 'path("M 26 4 A 90 180 110 0 1 130 150 A 190 200 110 0 1 -50 40")'}
+      ]);
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/d-interpolation-single.svg b/testing/web-platform/tests/svg/path/property/d-interpolation-single.svg
new file mode 100644
index 0000000000..107b607bec
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/d-interpolation-single.svg
@@ -0,0 +1,245 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:meta name="assert" content="Each path command interpolates."/>
+  </metadata>
+
+  <g id="container"/>
+
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="resources/interpolation-test-common.js"/>
+  <script><![CDATA[
+      'use strict';
+
+      // Exercise each segment type
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 20 70")',
+        to: 'path("M 100 30")'
+      }, [
+        {at: -1, expect: 'path("M -60 110")'},
+        {at: 0, expect: 'path("M 20 70")'},
+        {at: 0.125, expect: 'path("M 30 65")'},
+        {at: 0.875, expect: 'path("M 90 35")'},
+        {at: 1, expect: 'path("M 100 30")'},
+        {at: 2, expect: 'path("M 180 -10")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 20 70")',
+        to: 'path("m 100 30")'
+      }, [
+        {at: -1, expect: 'path("M -60 110")'},
+        {at: 0, expect: 'path("M 20 70")'},
+        {at: 0.125, expect: 'path("M 30 65")'},
+        {at: 0.875, expect: 'path("M 90 35")'},
+        {at: 1, expect: 'path("M 100 30")'},
+        {at: 2, expect: 'path("M 180 -10")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 100 200 L 120 270")',
+        to: 'path("m 100 200 L 200 230")'
+      }, [
+        {at: -1, expect: 'path("M 100 200 L 40 310")'},
+        {at: 0, expect: 'path("M 100 200 L 120 270")'},
+        {at: 0.125, expect: 'path("M 100 200 L 130 265")'},
+        {at: 0.875, expect: 'path("M 100 200 L 190 235")'},
+        {at: 1, expect: 'path("M 100 200 L 200 230")'},
+        {at: 2, expect: 'path("M 100 200 L 280 190")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 100 200 l 20 70")',
+        to: 'path("m 100 200 l 100 30")'
+      }, [
+        {at: -1, expect: 'path("M 100 200 L 40 310")'},
+        {at: 0, expect: 'path("M 100 200 L 120 270")'},
+        {at: 0.125, expect: 'path("M 100 200 L 130 265")'},
+        {at: 0.875, expect: 'path("M 100 200 L 190 235")'},
+        {at: 1, expect: 'path("M 100 200 L 200 230")'},
+        {at: 2, expect: 'path("M 100 200 L 280 190")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 20 10 C 32 42 52 62 120 2200")',
+        to: 'path("M 20 10 C 40 50 60 70 200 3000")',
+      }, [
+        {at: -1, expect: 'path("M 20 10 C 24 34 44 54 40 1400")'},
+        {at: 0, expect: 'path("M 20 10 C 32 42 52 62 120 2200")'},
+        {at: 0.125, expect: 'path("M 20 10 C 33 43 53 63 130 2300")'},
+        {at: 0.875, expect: 'path("M 20 10 C 39 49 59 69 190 2900")'},
+        {at: 1, expect: 'path("M 20 10 C 40 50 60 70 200 3000")'},
+        {at: 2, expect: 'path("M 20 10 C 48 58 68 78 280 3800")'}
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 20 10 c 12 32 32 52 100 2190")',
+        to: 'path("m 20 10 c 20 40 40 60 180 2990")'
+      }, [
+        {at: -1, expect: 'path("M 20 10 C 24 34 44 54 40 1400")'},
+        {at: 0, expect: 'path("M 20 10 C 32 42 52 62 120 2200")'},
+        {at: 0.125, expect: 'path("M 20 10 C 33 43 53 63 130 2300")'},
+        {at: 0.875, expect: 'path("M 20 10 C 39 49 59 69 190 2900")'},
+        {at: 1, expect: 'path("M 20 10 C 40 50 60 70 200 3000")'},
+        {at: 2, expect: 'path("M 20 10 C 48 58 68 78 280 3800")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 20 10 Q 32 42 120 2200")',
+        to: 'path("M 20 10 Q 40 50 200 3000")'
+      }, [
+        {at: -1, expect: 'path("M 20 10 Q 24 34 40 1400")'},
+        {at: 0, expect: 'path("M 20 10 Q 32 42 120 2200")'},
+        {at: 0.125, expect: 'path("M 20 10 Q 33 43 130 2300")'},
+        {at: 0.875, expect: 'path("M 20 10 Q 39 49 190 2900")'},
+        {at: 1, expect: 'path("M 20 10 Q 40 50 200 3000")'},
+        {at: 2, expect: 'path("M 20 10 Q 48 58 280 3800")'}
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 20 10 q 12 32 100 2190")',
+        to: 'path("m 20 10 q 20 40 180 2990")'
+      }, [
+        {at: -1, expect: 'path("M 20 10 Q 24 34 40 1400")'},
+        {at: 0, expect: 'path("M 20 10 Q 32 42 120 2200")'},
+        {at: 0.125, expect: 'path("M 20 10 Q 33 43 130 2300")'},
+        {at: 0.875, expect: 'path("M 20 10 Q 39 49 190 2900")'},
+        {at: 1, expect: 'path("M 20 10 Q 40 50 200 3000")'},
+        {at: 2, expect: 'path("M 20 10 Q 48 58 280 3800")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 100 400 A 10 20 30 1 0 140 450")',
+        to: 'path("M 300 200 A 50 60 70 0 1 380 290")'
+      }, [
+        {at: -1, expect: 'path("M -100 600 A -30 -20 -10 1 0 -100 610")'},
+        {at: 0, expect: 'path("M 100 400 A 10 20 30 1 0 140 450")'},
+        {at: 0.125, expect: 'path("M 125 375 A 15 25 35 1 0 170 430")'},
+        {at: 0.875, expect: 'path("M 275 225 A 45 55 65 0 1 350 310")'},
+        {at: 1, expect: 'path("M 300 200 A 50 60 70 0 1 380 290")'},
+        {at: 2, expect: 'path("M 500 0 A 90 100 110 0 1 620 130")'}
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 100 400 a 10 20 30 1 0 40 50")',
+        to: 'path("m 300 200 a 50 60 70 0 1 80 90")'
+      }, [
+        {at: -1, expect: 'path("M -100 600 A -30 -20 -10 1 0 -100 610")'},
+        {at: 0, expect: 'path("M 100 400 A 10 20 30 1 0 140 450")'},
+        {at: 0.125, expect: 'path("M 125 375 A 15 25 35 1 0 170 430")'},
+        {at: 0.875, expect: 'path("M 275 225 A 45 55 65 0 1 350 310")'},
+        {at: 1, expect: 'path("M 300 200 A 50 60 70 0 1 380 290")'},
+        {at: 2, expect: 'path("M 500 0 A 90 100 110 0 1 620 130")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 50 60 H 70")',
+        to: 'path("M 10 140 H 270")'
+      }, [
+        {at: -1, expect: 'path("M 90 -20 H -130")'},
+        {at: 0, expect: 'path("M 50 60 H 70")'},
+        {at: 0.125, expect: 'path("M 45 70 H 95")'},
+        {at: 0.875, expect: 'path("M 15 130 H 245")'},
+        {at: 1, expect: 'path("M 10 140 H 270")'},
+        {at: 2, expect: 'path("M -30 220 H 470")'}
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 50 60 h 20")',
+        to: 'path("m 10 140 h 260")'
+      }, [
+        {at: -1, expect: 'path("M 90 -20 H -130")'},
+        {at: 0, expect: 'path("M 50 60 H 70")'},
+        {at: 0.125, expect: 'path("M 45 70 H 95")'},
+        {at: 0.875, expect: 'path("M 15 130 H 245")'},
+        {at: 1, expect: 'path("M 10 140 H 270")'},
+        {at: 2, expect: 'path("M -30 220 H 470")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 50 60 V 70")',
+        to: 'path("M 10 140 V 270")'
+      }, [
+        {at: -1, expect: 'path("M 90 -20 V -130")'},
+        {at: 0, expect: 'path("M 50 60 V 70")'},
+        {at: 0.125, expect: 'path("M 45 70 V 95")'},
+        {at: 0.875, expect: 'path("M 15 130 V 245")'},
+        {at: 1, expect: 'path("M 10 140 V 270")'},
+        {at: 2, expect: 'path("M -30 220 V 470")'}
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 50 60 v 10")',
+        to: 'path("m 10 140 v 130")'
+      }, [
+        {at: -1, expect: 'path("M 90 -20 V -130")'},
+        {at: 0, expect: 'path("M 50 60 V 70")'},
+        {at: 0.125, expect: 'path("M 45 70 V 95")'},
+        {at: 0.875, expect: 'path("M 15 130 V 245")'},
+        {at: 1, expect: 'path("M 10 140 V 270")'},
+        {at: 2, expect: 'path("M -30 220 V 470")'}
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 12 34 S 45 67 89 123")',
+        to: 'path("M 20 26 S 61 51 113 99")'
+      }, [
+        {at: -1, expect: 'path("M 4 42 S 29 83 65 147")'},
+        {at: 0, expect: 'path("M 12 34 S 45 67 89 123")'},
+        {at: 0.125, expect: 'path("M 13 33 S 47 65 92 120")'},
+        {at: 0.875, expect: 'path("M 19 27 S 59 53 110 102")'},
+        {at: 1, expect: 'path("M 20 26 S 61 51 113 99")'},
+        {at: 2, expect: 'path("M 28 18 S 77 35 137 75")'},
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 12 34 s 33 33 77 89")',
+        to: 'path("m 20 26 s 41 25 93 73")'
+      }, [
+        {at: -1, expect: 'path("M 4 42 S 29 83 65 147")'},
+        {at: 0, expect: 'path("M 12 34 S 45 67 89 123")'},
+        {at: 0.125, expect: 'path("M 13 33 S 47 65 92 120")'},
+        {at: 0.875, expect: 'path("M 19 27 S 59 53 110 102")'},
+        {at: 1, expect: 'path("M 20 26 S 61 51 113 99")'},
+        {at: 2, expect: 'path("M 28 18 S 77 35 137 75")'},
+      ]);
+
+      test_interpolation({
+        property: 'd',
+        from: 'path("M 12 34 T 45 67")',
+        to: 'path("M 20 26 T 61 51")'
+      }, [
+        {at: -1, expect: 'path("M 4 42 T 29 83")'},
+        {at: 0, expect: 'path("M 12 34 T 45 67")'},
+        {at: 0.125, expect: 'path("M 13 33 T 47 65")'},
+        {at: 0.875, expect: 'path("M 19 27 T 59 53")'},
+        {at: 1, expect: 'path("M 20 26 T 61 51")'},
+        {at: 2, expect: 'path("M 28 18 T 77 35")'},
+      ]);
+      test_interpolation({
+        property: 'd',
+        from: 'path("m 12 34 t 33 33")',
+        to: 'path("m 20 26 t 41 25")'
+      }, [
+        {at: -1, expect: 'path("M 4 42 T 29 83")'},
+        {at: 0, expect: 'path("M 12 34 T 45 67")'},
+        {at: 0.125, expect: 'path("M 13 33 T 47 65")'},
+        {at: 0.875, expect: 'path("M 19 27 T 59 53")'},
+        {at: 1, expect: 'path("M 20 26 T 61 51")'},
+        {at: 2, expect: 'path("M 28 18 T 77 35")'},
+      ]);
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/getComputedStyle.svg b/testing/web-platform/tests/svg/path/property/getComputedStyle.svg
new file mode 100644
index 0000000000..400f92ec84
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/getComputedStyle.svg
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:meta name="assert" content="d is a property"/>
+  </metadata>
+  <style>
+    .p3 {
+      d: path('M 10 3 H 30');
+    }
+    .g5 {
+      d: path('m 10 5 h 40');
+    }
+    .p6 {
+      d: inherit;
+    }
+  </style>
+  <g id="g0">
+    <path id="p1"></path>
+    <path id="p2" d="M 10 2 H 20"></path>
+    <path id="p3" class="p3"></path>
+    <path id="p4" style="d: path('M 10 4 H 40')"></path>
+  </g>
+  <g id="g5" class="g5">
+    <path id="p6" class="p6"></path>
+    <path id="p7"></path>
+  </g>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <script><![CDATA[
+  function test_computed_value_of_d(id, expected) {
+    test(function() {
+      let target = document.getElementById(id);
+      assert_equals(getComputedStyle(target).d, expected);
+    }, `d property of ${id} should be ${expected}.`);
+  }
+
+  test_computed_value_of_d('g0', 'none');
+  test_computed_value_of_d('p1', 'none');
+  test_computed_value_of_d('p2', 'path("M 10 2 H 20")');
+  test_computed_value_of_d('p3', 'path("M 10 3 H 30")');
+  test_computed_value_of_d('p4', 'path("M 10 4 H 40")');
+  test_computed_value_of_d('g5', 'path("M 10 5 H 50")');
+  test_computed_value_of_d('p6', 'path("M 10 5 H 50")');
+  test_computed_value_of_d('p7', 'none');
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/marker-path-ref.svg b/testing/web-platform/tests/svg/path/property/marker-path-ref.svg
new file mode 100644
index 0000000000..8cd5c8ea48
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/marker-path-ref.svg
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml" width="300" height="300">
+  <defs>
+    <marker id="Start"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="green">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+    <marker id="Mid"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="orange">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+    <marker id="End"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="blue">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+  </defs>
+
+  <g style="fill:none;stroke:black;stroke-width:2;marker-start:url(#Start);marker-mid:url(#Mid);marker-end:url(#End)">
+    <path d="M 50,50  l 50,0  l 50,0   l 50,0"/>
+    <path d="M 50,100 l 50,20 l 50,-20 l 50,20"/>
+    <path d="M 50,150 h 50 v 50 h 50"/>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/marker-path.svg b/testing/web-platform/tests/svg/path/property/marker-path.svg
new file mode 100644
index 0000000000..c03e9c515c
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/marker-path.svg
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml" width="300" height="300">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:link rel="match" href="marker-path-ref.svg"/>
+    <h:meta name="assert" content="d property is used for SVG markers."/>
+  </metadata>
+  <defs>
+    <marker id="Start"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="green">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+    <marker id="Mid"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="orange">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+    <marker id="End"
+            viewBox="0 0 10 10" refX="0" refY="5"
+            markerUnits="strokeWidth"
+            markerWidth="10"
+            markerHeight="10"
+            orient="auto"
+            overflow="visible"
+            fill="blue">
+      <path d="M 0 0 L 10 5 L 0 10 z"/>
+    </marker>
+  </defs>
+
+  <g style="fill:none;stroke:black;stroke-width:2;marker-start:url(#Start);marker-mid:url(#Mid);marker-end:url(#End)">
+    <path style='d: path("M 50,50  l 50,0  l 50,0   l 50,0");'/>
+    <path style='d: path("M 50,100 l 50,20 l 50,-20 l 50,20");'/>
+    <path style='d: path("M 50,150 h 50 v 50 h 50");'/>
+  </g>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/mpath-ref.svg b/testing/web-platform/tests/svg/path/property/mpath-ref.svg
new file mode 100644
index 0000000000..db281c33da
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/mpath-ref.svg
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100">
+  <path d="M20,50 h100" fill="none" stroke="black"/>
+  <circle r="5" fill="red" transform="translate(70 50)"/>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/mpath.svg b/testing/web-platform/tests/svg/path/property/mpath.svg
new file mode 100644
index 0000000000..c4233b1705
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/mpath.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     xmlns:h="http://www.w3.org/1999/xhtml" width="200" height="100">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:link rel="match" href="mpath-ref.svg"/>
+    <h:meta name="assert" content="d property is used for SVG mpath ref path."/>
+  </metadata>
+  <path style='d: path("M20,50 h100");' fill="none" stroke="black" id="path_ref"/>
+
+  <circle r="5" fill="red">
+    <!-- The red circle should always be in the middle of the path -->
+    <animateMotion dur="10s" repeatCount="indefinite" keyPoints="0.5;0.5" keyTimes="0;1">
+       <mpath xlink:href="#path_ref"/>
+    </animateMotion>
+  </circle>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/priority-ref.svg b/testing/web-platform/tests/svg/path/property/priority-ref.svg
new file mode 100644
index 0000000000..cbc7c385f6
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/priority-ref.svg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+  </style>
+  <path d="M 20 10 h 70" />
+  <path d="M 20 80 h 70" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/priority.svg b/testing/web-platform/tests/svg/path/property/priority.svg
new file mode 100644
index 0000000000..ef187c1913
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/priority.svg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml" width="100" height="100">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:link rel="match" href="priority-ref.svg"/>
+    <h:meta name="assert" content="Property overrides attribute."/>
+  </metadata>
+  <style>
+    path {
+      stroke-width: 3;
+      stroke: blue;
+    }
+    #top {
+      d: path('M 20 10 h 70');
+    }
+  </style>
+  <path id="top" d="M 10 20 h 70" />
+  <path d="M 10 90 h 70" style="d: path('M 20 80 h 70')" />
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/resources/interpolation-test-common.js b/testing/web-platform/tests/svg/path/property/resources/interpolation-test-common.js
new file mode 100644
index 0000000000..b7f8cd308d
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/resources/interpolation-test-common.js
@@ -0,0 +1,71 @@
+'use strict';
+function test_interpolation(settings, expectations) {
+
+  test(function(){
+    assert_true(CSS.supports(settings.property, settings.from), 'Value "' + settings.from + '" is supported by ' + settings.property);
+    assert_true(CSS.supports(settings.property, settings.to), 'Value "' + settings.to + '" is supported by ' + settings.property);
+  }, '"' + settings.from + '" and "' + settings.to + '" are valid ' + settings.property + ' values');
+
+  const container = document.getElementById('container');
+  for (let i = 0; i < expectations.length; ++i) {
+    const progress = expectations[i].at;
+    const expectation = expectations[i].expect;
+    const animationId = 'anim' + i;
+    const targetId = 'target' + i;
+    const referenceId = 'reference' + i;
+
+    test(function(){
+      assert_true(CSS.supports(settings.property, expectation), 'Value "' + expectation + '" is supported by ' + settings.property);
+
+      const target = document.createElementNS('http://www.w3.org/2000/svg', 'g');
+      target.id = targetId;
+      container.appendChild(target);
+
+      const reference = document.createElementNS('http://www.w3.org/2000/svg', 'g');
+      reference.id = referenceId;
+      container.appendChild(reference);
+
+      assert_equals(getComputedStyle(target)[settings.property], getComputedStyle(reference)[settings.property]);
+
+      // Create an animation of length 2s that starts at -1s so the current time of 0s is
+      // exactly halfway through the animation. A cubic bezier timing function is used that
+      // evaluates to |progress| at the current time (halfway through the animation).
+
+      // Cubic bezier evaluates to |progress| at 50%.
+      const y = (8 * progress - 1) / 6;
+      const timing_function = 'cubic-bezier(0, ' + y + ', 1, ' + y + ')';
+
+      const stylesheet = document.createElementNS('http://www.w3.org/2000/svg', 'style');
+      stylesheet.textContent =
+        '#' + targetId + ' {\n' +
+        '  animation: 2s ' + timing_function + ' -1s paused ' + animationId + ';\n' +
+        '}\n' +
+        '@keyframes ' + animationId + ' {\n' +
+        '  0% { ' + settings.property + ': ' + settings.from + '; }\n' +
+        '  100% { ' + settings.property + ': ' + settings.to + '; }\n' +
+        '}\n' +
+        '#' + referenceId + ' {\n' +
+        '  ' + settings.property + ': ' + expectation + ';\n' +
+        '}\n';
+      container.appendChild(stylesheet);
+
+      assert_equals(getComputedStyle(target)[settings.property], getComputedStyle(reference)[settings.property]);
+      assert_equals(getComputedStyle(target)[settings.property], expectation);
+
+      container.removeChild(target);
+      container.removeChild(reference);
+      container.removeChild(stylesheet);
+    }, 'Animation between "' + settings.from + '" and "' + settings.to + '" at progress ' + progress);
+  }
+}
+
+function test_no_interpolation(settings) {
+  const expectFrom = [-1, 0, 0.125].map(function (progress) {
+    return {at: progress, expect: settings.from};
+  });
+  const expectTo = [0.875, 1, 2].map(function (progress) {
+    return {at: progress, expect: settings.to};
+  });
+
+  test_interpolation(settings, expectFrom.concat(expectTo));
+}
diff --git a/testing/web-platform/tests/svg/path/property/serialization.svg b/testing/web-platform/tests/svg/path/property/serialization.svg
new file mode 100644
index 0000000000..3199beb92b
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/serialization.svg
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:h="http://www.w3.org/1999/xhtml">
+  <metadata>
+    <h:link rel="help" href="https://svgwg.org/svg2-draft/paths.html#TheDProperty"/>
+    <h:meta name="assert" content="computed d is serialized using absolute commands"/>
+  </metadata>
+  <path id="target"></path>
+  <h:script src="/resources/testharness.js"/>
+  <h:script src="/resources/testharnessreport.js"/>
+  <h:script src="/css/support/parsing-testcommon.js"/>
+  <h:script src="/css/support/computed-testcommon.js"/>
+  <script><![CDATA[
+  let test1 = 'path("m 10 20 q 30 60 40 50 q 100 70 90 80")';
+  test_valid_value('d', test1);
+  test_computed_value('d', test1, 'path("M 10 20 Q 40 80 50 70 Q 150 140 140 150")');
+
+  let test2 = 'path("M 0 0 L 100 100 m 0 100 l 100 0 Z l 160 20 Z")';
+  test_valid_value('d', test2);
+  test_computed_value('d', test2);
+
+  let test3 = 'path("m 10 20   l 20 30   Z   l 50 60   Z   m 70 80   l 90 60   Z   t 70 120")';
+  test_valid_value('d', test3, 'path("m 10 20 l 20 30 Z l 50 60 Z m 70 80 l 90 60 Z t 70 120")');
+  test_computed_value('d', test3, 'path("M 10 20 L 30 50 Z L 60 80 Z M 80 100 L 170 160 Z T 150 220")');
+
+  let test4 = 'path("m 10.0 170.0 h 90.00 v 30.00 m 0 0 s 1 2 3 4 z c 9 8 7 6 5 4")';
+  test_valid_value('d', test4, 'path("m 10 170 h 90 v 30 m 0 0 s 1 2 3 4 Z c 9 8 7 6 5 4")');
+  test_computed_value('d', test4, 'path("M 10 170 H 100 V 200 M 100 200 S 101 202 103 204 Z C 109 208 107 206 105 204")');
+
+  let test5 = '  path(  "m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50"  )';
+  test_valid_value('d', test5, 'path("m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50")');
+  test_computed_value('d', test5, 'path("M 10 20 A 10 20 30 1 0 50 70 A 110 120 30 1 1 190 120")');
+  ]]></script>
+</svg>
diff --git a/testing/web-platform/tests/svg/path/property/test_style_flush_on_dom_api_with_d_property.html b/testing/web-platform/tests/svg/path/property/test_style_flush_on_dom_api_with_d_property.html
new file mode 100644
index 0000000000..248118443b
--- /dev/null
+++ b/testing/web-platform/tests/svg/path/property/test_style_flush_on_dom_api_with_d_property.html
@@ -0,0 +1,80 @@
+<!DOCTYPE html>
+<title>Test DOM APIs which flush the style properly, with d property</title>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<style>
+svg {
+  width: 10%;
+  height: 10%;
+  background: #eee;
+}
+svg path {
+  fill: none;
+  stroke: #000;
+}
+</style>
+
+<div id="log"></div>
+
+<svg viewBox="0 0 20 20" id="svgroot"></svg>
+
+<script>
+'use strict';
+
+function createPath(t) {
+  const target = document.createElementNS("http://www.w3.org/2000/svg", "path");
+  document.getElementById('svgroot').appendChild(target);
+
+  if (t && typeof t.add_cleanup === "function") {
+    t.add_cleanup(function() {
+      target.remove();
+    });
+  }
+
+  // Set an initial d and flush style first to make sure the following DOM APIs
+  // do flush again.
+  target.style.d = 'path("M 0 0")';
+  assert_equals(getComputedStyle(target).d, 'path("M 0 0")', "the initial d");
+  return target;
+}
+
+test(function(t) {
+  const target = createPath(t);
+  target.style.d = 'path("M5,5 L10,5 L10,10")';
+  assert_equals(target.getTotalLength(), 10, "the total length");
+}, "getTotalLength() with d property");
+
+test(function(t) {
+  const target = createPath(t);
+  target.style.d = 'path("M5,5 L10,5 L10,10")';
+  // The first segment of path is (5,5) to (10,5), its length is 5.
+  // The second segment of path is (10,5) to (10,10), its length is 5.
+  // So, the length 8 is on the 2nd segment, at (10,8).
+  const point = target.getPointAtLength(8);
+  assert_equals(point.x, 10, "x-axis position");
+  assert_equals(point.y, 8, "y-axis position");
+}, "getPointAtLength() with d property");
+
+test(function(t) {
+  const target = createPath(t);
+  const svgPoint = document.getElementById("svgroot").createSVGPoint();
+  svgPoint.x = 10;
+  svgPoint.y = 8;
+
+  target.style.d = 'path("M5,5 L10,5 L10,10")';
+  assert_equals(target.isPointInFill(svgPoint), true);
+}, "isPointInFill() with d property");
+
+test(function(t) {
+  const target = createPath(t);
+  const svgPoint = document.getElementById("svgroot").createSVGPoint();
+  svgPoint.x = 10;
+  svgPoint.y = 8;
+
+  target.style.d = 'path("M5,5 L10,5 L10,10")';
+  assert_equals(target.isPointInStroke(svgPoint), true);
+}, "isPointInStroke() with d property");
+
+</script>