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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /testing/web-platform/tests/html/rendering/the-details-element
parentInitial commit. (diff)
downloadthunderbird-upstream.tar.xz
thunderbird-upstream.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/html/rendering/the-details-element')
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-after.html12
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-before.html12
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-blockification.html35
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored-ref.html21
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored.html26
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-1-print.html20
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-2-print.html20
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-1-print.html20
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-2-print.html20
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-revert-ref.html19
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-revert.html18
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/details-two-pages-print-ref.html12
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/empty-crash.html7
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/single-summary.html6
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex-ref.html105
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex.html112
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid-ref.html72
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html77
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex-ref.html105
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex.html112
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid-ref.html72
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid.html77
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001-ref.html28
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001.html34
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002-ref.html13
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002.html23
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol-ref.html20
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol.html22
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration-ref.html11
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration.html11
-rw-r--r--testing/web-platform/tests/html/rendering/the-details-element/two-summaries-removal-crash.html17
31 files changed, 1159 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-after.html b/testing/web-platform/tests/html/rendering/the-details-element/details-after.html
new file mode 100644
index 0000000000..b4bf050466
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-after.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="help" title="https://github.com/whatwg/html/pull/3686">
+<link rel="help" title="https://html.spec.whatwg.org/multipage/#the-details-element">
+<link rel="mismatch" href="single-summary.html">
+<title>CSS Test: details ::after pseudo-element</title>
+<style>
+ details::after { content: "::after" }
+</style>
+<details>
+ <summary>This is the main summary</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-before.html b/testing/web-platform/tests/html/rendering/the-details-element/details-before.html
new file mode 100644
index 0000000000..3dd95e311a
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-before.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<link rel="help" title="https://github.com/whatwg/html/pull/3686">
+<link rel="help" title="https://html.spec.whatwg.org/multipage/#the-details-element">
+<link rel="mismatch" href="single-summary.html">
+<title>CSS Test: details ::before pseudo-element</title>
+<style>
+ details::before { content: "::before" }
+</style>
+<details>
+ <summary>This is the main summary</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-blockification.html b/testing/web-platform/tests/html/rendering/the-details-element/details-blockification.html
new file mode 100644
index 0000000000..960074854d
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-blockification.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: details children blockification</title>
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Ensure blockification of <details> children">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<div id="example1">
+ <details style="display: grid" open>
+ <summary style="display: inline">foo</summary>
+ <div style="display: inline">bar</span>
+ </details>
+</div>
+
+<div id="example2" style="display: grid">
+ <details style="display: contents" open>
+ <summary style="display: inline">foo</summary>
+ <div style="display: inline">bar</span>
+ </details>
+</div>
+
+<script>
+ function checkDetails(details) {
+ assert_equals(getComputedStyle(details.querySelector('summary')).display, "block");
+ assert_equals(getComputedStyle(details.querySelector('div')).display, "block");
+ }
+ test(() => {
+ checkDetails(document.querySelector('#example1'));
+ checkDetails(document.querySelector('#example2'));
+ assert_equals(getComputedStyle(document.querySelector('#example2>details')).display, "contents");
+ }, "Summary and content should have display:block computed value");
+
+</script>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored-ref.html
new file mode 100644
index 0000000000..6ebed6075d
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="David Grogan" href="dgrogan@chromium.org">
+From <a href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">html.spec.whatwg.org</a>:
+
+<blockquote>
+The details element is expected to render as a block box. The element's shadow
+tree is expected to take the element's first summary element child, if any, and
+place it in a first block box container, and then take the element's remaining
+descendants, if any, and place them in a second block box container.
+</blockquote>
+
+&lt;details display:flex> should be ignored. Otherwise details would render as
+something other than a block box.
+<hr>
+
+<details open>
+ <summary>This is the summary.</summary>
+ <div>thing 1</div>
+ thing 2
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored.html b/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored.html
new file mode 100644
index 0000000000..445b4e483d
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-display-property-is-ignored.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="David Grogan" href="dgrogan@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<link rel="match" href="details-display-property-is-ignored-ref.html">
+<link rel="bookmark" href="https://bugs.chromium.org/p/chromium/issues/detail?id=635282" />
+<meta name="assert" content="The display property is ignored on details elements and is instead always rendered as a block box." />
+
+From <a href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">html.spec.whatwg.org</a>:
+
+<blockquote>
+The details element is expected to render as a block box. The element's shadow
+tree is expected to take the element's first summary element child, if any, and
+place it in a first block box container, and then take the element's remaining
+descendants, if any, and place them in a second block box container.
+</blockquote>
+
+&lt;details display:flex> should be ignored. Otherwise details would render as
+something other than a block box.
+<hr>
+
+<details open style="display:flex;">
+ <summary>This is the summary.</summary>
+ <div>thing 1</div>
+ thing 2
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-1-print.html b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-1-print.html
new file mode 100644
index 0000000000..cb7fc466d0
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-1-print.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <link rel="match" href="details-two-pages-print-ref.html">
+ <link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+ <style>
+ summary {
+ /* Hide the triangle for comparing with div in reftest. */
+ list-style-type: none;
+ }
+ </style>
+ <body>
+ <details open>
+ <summary style="page-break-after: always;">Summary</summary>
+ <p>This is the details.</p>
+ </details>
+ </body>
+</html>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-2-print.html b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-2-print.html
new file mode 100644
index 0000000000..2f3d12bbe3
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-after-2-print.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <link rel="match" href="details-two-pages-print-ref.html">
+ <link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+ <style>
+ summary {
+ /* Hide the triangle for comparing with div in reftest. */
+ list-style-type: none;
+ }
+ </style>
+ <body>
+ <details open>
+ <summary>Summary<div style="page-break-before: always;"></div></summary>
+ <p>This is the details.</p>
+ </details>
+ </body>
+</html>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-1-print.html b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-1-print.html
new file mode 100644
index 0000000000..5abf4c39ae
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-1-print.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <link rel="match" href="details-two-pages-print-ref.html">
+ <link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+ <style>
+ summary {
+ /* Hide the triangle for comparing with div in reftest. */
+ list-style-type: none;
+ }
+ </style>
+ <body>
+ <details open>
+ <summary>Summary</summary>
+ <p style="page-break-before: always;">This is the details.</p>
+ </details>
+ </body>
+</html>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-2-print.html b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-2-print.html
new file mode 100644
index 0000000000..2f3d12bbe3
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-page-break-before-2-print.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <link rel="match" href="details-two-pages-print-ref.html">
+ <link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+ <style>
+ summary {
+ /* Hide the triangle for comparing with div in reftest. */
+ list-style-type: none;
+ }
+ </style>
+ <body>
+ <details open>
+ <summary>Summary<div style="page-break-before: always;"></div></summary>
+ <p>This is the details.</p>
+ </details>
+ </body>
+</html>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-revert-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/details-revert-ref.html
new file mode 100644
index 0000000000..dc46b15901
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-revert-ref.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>CSS Test Reference</title>
+<style>
+ summary {
+ display: list-item;
+ counter-increment: list-item 0;
+ list-style: disclosure-closed inside;
+ }
+ details[open] > summary {
+ list-style-type: disclosure-open;
+ }
+</style>
+<details>
+ <summary>Example</summary>
+</details>
+<details open>
+ <summary>Example</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-revert.html b/testing/web-platform/tests/html/rendering/the-details-element/details-revert.html
new file mode 100644
index 0000000000..760cc8281e
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-revert.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<meta charset="utf-8">
+<link rel="help" href="https://html.spec.whatwg.org/#the-details-and-summary-elements">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1804925">
+<link rel="match" href="details-revert-ref.html">
+<style>
+ summary {
+ display: revert;
+ counter-increment: revert;
+ list-style: revert;
+ }
+</style>
+<details>
+ <summary>Example</summary>
+</details>
+<details open>
+ <summary>Example</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/details-two-pages-print-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/details-two-pages-print-ref.html
new file mode 100644
index 0000000000..309a138696
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/details-two-pages-print-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <body>
+ <div>
+ <div style="page-break-after: always;">Summary</div>
+ <p>This is the details.</p>
+ </div>
+ </body>
+</html>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/empty-crash.html b/testing/web-platform/tests/html/rendering/the-details-element/empty-crash.html
new file mode 100644
index 0000000000..d409eff4a8
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/empty-crash.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<link rel="help" href="https://crbug.com/1068227">
+<style>
+body { display: flex; }
+details, summary { display: inherit; }
+</style>
+<details><summary>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/single-summary.html b/testing/web-platform/tests/html/rendering/the-details-element/single-summary.html
new file mode 100644
index 0000000000..1f09e7e75f
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/single-summary.html
@@ -0,0 +1,6 @@
+<!doctype html>
+<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
+<title>CSS Test Reference</title>
+<details>
+ <summary>This is the main summary</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex-ref.html
new file mode 100644
index 0000000000..083dba8795
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex-ref.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<style>
+.flex-container {
+ background: #333;
+ border: 0px;
+ display: flex;
+ margin: 0px;
+ padding: 0px;
+}
+
+.flex-container.flex-direction-row {
+ flex-direction : row;
+}
+
+.flex-container.flex-direction-row-reverse {
+ flex-direction : row-reverse;
+}
+
+.flex-container.flex-direction-column {
+ flex-direction : column;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.justify-content-center {
+ justify-content: center;
+}
+
+.flex-container.justify-content-space-around {
+ justify-content: space-around;
+}
+
+.flex-container.justify-content-space-between {
+ justify-content: space-between;
+}
+
+.flex-item {
+ width:50px;
+ height:50px;
+ margin:20px;
+ background: #eee;
+ line-height: 50px;
+ text-align: center;
+}
+</style>
+
+<summary>
+ <div>these fieldsshouldn't bestacked vertically</div>
+</summary>
+
+<h1>flex-direction: row</h1>
+<div class="flex-container flex-direction-row">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: row-reverse</h1>
+<div class="flex-container flex-direction-row-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: column</h1>
+<div class="flex-container flex-direction-column">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: column-reverse</h1>
+<div class="flex-container flex-direction-column-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: center</h1>
+<div class="flex-container justify-content-center">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: space-around</h1>
+<div class="flex-container justify-content-space-around">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: space-between</h1>
+<div class="flex-container justify-content-space-between">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex.html
new file mode 100644
index 0000000000..c495516cf3
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-flex.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: flex'</title>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<link rel="match" href="summary-display-flex-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: flex' makes it a flex container.">
+<style>
+.flex-container {
+ background: #333;
+ border: 0px;
+ display: flex;
+ margin: 0px;
+ padding: 0px;
+}
+
+.flex-container.flex-direction-row {
+ flex-direction : row;
+}
+
+.flex-container.flex-direction-row-reverse {
+ flex-direction : row-reverse;
+}
+
+.flex-container.flex-direction-column {
+ flex-direction : column;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.justify-content-center {
+ justify-content: center;
+}
+
+.flex-container.justify-content-space-around {
+ justify-content: space-around;
+}
+
+.flex-container.justify-content-space-between {
+ justify-content: space-between;
+}
+
+.flex-item {
+ width:50px;
+ height:50px;
+ margin:20px;
+ background: #eee;
+ line-height: 50px;
+ text-align: center;
+}
+</style>
+
+<summary style="display: flex;">
+ <div>these fields</div>
+ <div>shouldn't be</div>
+ <div>stacked vertically</div>
+</summary>
+
+<h1>flex-direction: row</h1>
+<summary class="flex-container flex-direction-row">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: row-reverse</h1>
+<summary class="flex-container flex-direction-row-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: column</h1>
+<summary class="flex-container flex-direction-column">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: column-reverse</h1>
+<summary class="flex-container flex-direction-column-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: center</h1>
+<summary class="flex-container justify-content-center">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: space-around</h1>
+<summary class="flex-container justify-content-space-around">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: space-between</h1>
+<summary class="flex-container justify-content-space-between">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid-ref.html
new file mode 100644
index 0000000000..a7c4c4c014
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid-ref.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<style>
+.grid-container {
+ display: grid;
+ grid-template-columns: 200px 10px 0.3fr 10px 0.7fr;
+ grid-template-rows: auto 20px auto;
+}
+
+.grid-element {
+ background-color: #444;
+ color: #fff;
+ padding: 20px;
+ font-size: 2em;
+}
+
+.element-a {
+ grid-column-start: 1;
+ grid-column-end: ;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #6F9;
+}
+
+.element-b {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #69F;
+}
+
+.element-c {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #F69;
+}
+
+.element-d {
+ grid-column-start: 1;
+ grid-column-end: 2;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #9F6;
+}
+
+.element-e {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #96F;
+}
+
+.element-f {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #F96;
+}
+</style>
+<div class="grid-container">
+ <div class="grid-element element-a">A</div>
+ <div class="grid-element element-b">B</div>
+ <div class="grid-element element-c">C</div>
+ <div class="grid-element element-d">D</div>
+ <div class="grid-element element-e">E</div>
+ <div class="grid-element element-f">F</div>
+</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html
new file mode 100644
index 0000000000..934b4ff595
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-grid.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: grid'</title>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<link rel="match" href="summary-display-grid-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: grid' makes it a grid container.">
+<style>
+.grid-container {
+ display: grid;
+ grid-template-columns: 200px 10px 0.3fr 10px 0.7fr;
+ grid-template-rows: auto 20px auto;
+}
+
+.grid-element {
+ background-color: #444;
+ color: #fff;
+ padding: 20px;
+ font-size: 2em;
+}
+
+.element-a {
+ grid-column-start: 1;
+ grid-column-end: ;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #6F9;
+}
+
+.element-b {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #69F;
+}
+
+.element-c {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #F69;
+}
+
+.element-d {
+ grid-column-start: 1;
+ grid-column-end: 2;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #9F6;
+}
+
+.element-e {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #96F;
+}
+
+.element-f {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #F96;
+}
+</style>
+<summary class="grid-container">
+ <div class="grid-element element-a">A</div>
+ <div class="grid-element element-b">B</div>
+ <div class="grid-element element-c">C</div>
+ <div class="grid-element element-d">D</div>
+ <div class="grid-element element-e">E</div>
+ <div class="grid-element element-f">F</div>
+</summary>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex-ref.html
new file mode 100644
index 0000000000..25a9b315f4
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex-ref.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<style>
+.flex-container {
+ background: #333;
+ border: 0px;
+ display: inline-flex;
+ margin: 0px;
+ padding: 0px;
+}
+
+.flex-container.flex-direction-row {
+ flex-direction : row;
+}
+
+.flex-container.flex-direction-row-reverse {
+ flex-direction : row-reverse;
+}
+
+.flex-container.flex-direction-column {
+ flex-direction : column;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.justify-content-center {
+ justify-content: center;
+}
+
+.flex-container.justify-content-space-around {
+ justify-content: space-around;
+}
+
+.flex-container.justify-content-space-between {
+ justify-content: space-between;
+}
+
+.flex-item {
+ width:50px;
+ height:50px;
+ margin:20px;
+ background: #eee;
+ line-height: 50px;
+ text-align: center;
+}
+</style>
+
+<summary>
+ <div>these fieldsshouldn't bestacked vertically</div>
+</summary>
+
+<h1>flex-direction: row</h1>
+<div class="flex-container flex-direction-row">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: row-reverse</h1>
+<div class="flex-container flex-direction-row-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: column</h1>
+<div class="flex-container flex-direction-column">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>flex-direction: column-reverse</h1>
+<div class="flex-container flex-direction-column-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: center</h1>
+<div class="flex-container justify-content-center">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: space-around</h1>
+<div class="flex-container justify-content-space-around">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
+
+<h1>justify-content: space-between</h1>
+<div class="flex-container justify-content-space-between">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex.html
new file mode 100644
index 0000000000..2c935e42b8
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-flex.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: inline-flex'</title>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<link rel="match" href="summary-display-inline-flex-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: inline-flex' makes it a flex container.">
+<style>
+.flex-container {
+ background: #333;
+ border: 0px;
+ display: inline-flex;
+ margin: 0px;
+ padding: 0px;
+}
+
+.flex-container.flex-direction-row {
+ flex-direction : row;
+}
+
+.flex-container.flex-direction-row-reverse {
+ flex-direction : row-reverse;
+}
+
+.flex-container.flex-direction-column {
+ flex-direction : column;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.flex-direction-column-reverse {
+ flex-direction : column-reverse;
+}
+
+.flex-container.justify-content-center {
+ justify-content: center;
+}
+
+.flex-container.justify-content-space-around {
+ justify-content: space-around;
+}
+
+.flex-container.justify-content-space-between {
+ justify-content: space-between;
+}
+
+.flex-item {
+ width:50px;
+ height:50px;
+ margin:20px;
+ background: #eee;
+ line-height: 50px;
+ text-align: center;
+}
+</style>
+
+<summary style="display: inline-flex;">
+ <div>these fields</div>
+ <div>shouldn't be</div>
+ <div>stacked vertically</div>
+</summary>
+
+<h1>flex-direction: row</h1>
+<summary class="flex-container flex-direction-row">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: row-reverse</h1>
+<summary class="flex-container flex-direction-row-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: column</h1>
+<summary class="flex-container flex-direction-column">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>flex-direction: column-reverse</h1>
+<summary class="flex-container flex-direction-column-reverse">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: center</h1>
+<summary class="flex-container justify-content-center">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: space-around</h1>
+<summary class="flex-container justify-content-space-around">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
+
+<h1>justify-content: space-between</h1>
+<summary class="flex-container justify-content-space-between">
+ <div class="flex-item">1</div>
+ <div class="flex-item">2</div>
+ <div class="flex-item">3</div>
+</summary>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid-ref.html
new file mode 100644
index 0000000000..f6a8b04bec
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid-ref.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<style>
+.grid-container {
+ display: inline-grid;
+ grid-template-columns: 200px 10px 0.3fr 10px 0.7fr;
+ grid-template-rows: auto 20px auto;
+}
+
+.grid-element {
+ background-color: #444;
+ color: #fff;
+ padding: 20px;
+ font-size: 2em;
+}
+
+.element-a {
+ grid-column-start: 1;
+ grid-column-end: ;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #6F9;
+}
+
+.element-b {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #69F;
+}
+
+.element-c {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #F69;
+}
+
+.element-d {
+ grid-column-start: 1;
+ grid-column-end: 2;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #9F6;
+}
+
+.element-e {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #96F;
+}
+
+.element-f {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #F96;
+}
+</style>
+<div class="grid-container">
+ <div class="grid-element element-a">A</div>
+ <div class="grid-element element-b">B</div>
+ <div class="grid-element element-c">C</div>
+ <div class="grid-element element-d">D</div>
+ <div class="grid-element element-e">E</div>
+ <div class="grid-element element-f">F</div>
+</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid.html
new file mode 100644
index 0000000000..3578f050e2
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-inline-grid.html
@@ -0,0 +1,77 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: inline-grid'</title>
+<link rel="author" title="Xing Xu" href="mailto:xing.xu@intel.com">
+<link rel="match" href="summary-display-inline-grid-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: inline-grid' makes it a grid container.">
+<style>
+.grid-container {
+ display: inline-grid;
+ grid-template-columns: 200px 10px 0.3fr 10px 0.7fr;
+ grid-template-rows: auto 20px auto;
+}
+
+.grid-element {
+ background-color: #444;
+ color: #fff;
+ padding: 20px;
+ font-size: 2em;
+}
+
+.element-a {
+ grid-column-start: 1;
+ grid-column-end: ;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #6F9;
+}
+
+.element-b {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #69F;
+}
+
+.element-c {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 1;
+ grid-row-end: 2;
+ background: #F69;
+}
+
+.element-d {
+ grid-column-start: 1;
+ grid-column-end: 2;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #9F6;
+}
+
+.element-e {
+ grid-column-start: 3;
+ grid-column-end: 4;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #96F;
+}
+
+.element-f {
+ grid-column-start: 5;
+ grid-column-end: 6;
+ grid-row-start: 3;
+ grid-row-end: 4;
+ background: #F96;
+}
+</style>
+<summary class="grid-container">
+ <div class="grid-element element-a">A</div>
+ <div class="grid-element element-b">B</div>
+ <div class="grid-element element-c">C</div>
+ <div class="grid-element element-d">D</div>
+ <div class="grid-element element-e">E</div>
+ <div class="grid-element element-f">F</div>
+</summary>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001-ref.html
new file mode 100644
index 0000000000..31e98d3fdc
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001-ref.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Reference: summary with 'display: list-item'</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<style>
+details {
+ margin-left: 50px;
+}
+.inside {
+ list-style-position: inside;
+}
+</style>
+<details>
+ <summary>summary</summary>
+ content
+</details>
+<details>
+ <summary class="inside">summary</summary>
+ content
+</details>
+<details open>
+ <summary>summary</summary>
+ content
+</details>
+<details open>
+ <summary class="inside">summary</summary>
+ content
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001.html
new file mode 100644
index 0000000000..8b94f10f27
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-001.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: list-item'</title>
+<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
+<link rel="match" href="summary-display-list-item-001-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that styling a <summary> with 'display: list-item' has no effect since it should already be a list item by default.">
+<style>
+summary {
+ display: list-item;
+}
+details {
+ margin-left: 50px;
+}
+.inside {
+ list-style-position: inside;
+}
+</style>
+<details>
+ <summary>summary</summary>
+ content
+</details>
+<details>
+ <summary class="inside">summary</summary>
+ content
+</details>
+<details open>
+ <summary>summary</summary>
+ content
+</details>
+<details open>
+ <summary class="inside">summary</summary>
+ content
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002-ref.html
new file mode 100644
index 0000000000..317e1cfe7d
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: list-item' and flex children</title>
+<link rel="author" title="Cameron McCormack" href="mailto:">
+<link rel="author" title="Sergio Villar Senin" href="mailto:svillar@igalia.com">
+<div style="width: 100px;">
+ <div style="display: list-item; list-style-type: none;">
+ <div style="display: flex; justify-content: space-between;">
+ <div>AAA</div>
+ <div>BBB</div>
+ </div>
+ </div>
+</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002.html
new file mode 100644
index 0000000000..ee32997009
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-display-list-item-002.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Test: summary with 'display: list-item' and flex children</title>
+<link rel="author" title="Cameron McCormack" href="mailto:heycam@apple.com">
+<link rel="author" title="Sergio Villar Senin" href="mailto:svillar@igalia.com">
+<link rel="match" href="summary-display-list-item-002-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<style>
+summary {
+ display: list-item;
+ list-style-type: none;
+}
+/* WebKit does not support list-style-type:none yet */
+summary::-webkit-details-marker { display: none; }
+</style>
+<details style="width: 100px;">
+ <summary>
+ <div style="display: flex; justify-content: space-between;">
+ <div>AAA</div>
+ <div>BBB</div>
+ </div>
+ </summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol-ref.html
new file mode 100644
index 0000000000..bb6f79b627
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+
+<ol>
+ <details><summary>summary</summary></details>
+ <li value="1">1</li>
+ <li value="2">2 <details><summary>summary</summary></details></li>
+ <li value="3">3</li>
+ <details><summary>summary</summary></details>
+ <li value="4">4</li>
+</ol>
+
+<ol>
+ <summary>summary</summary>
+ <li value="1">1</li>
+ <li value="2">2 <summary>summary</summary></li>
+ <li value="3">3</li>
+ <summary>summary</summary>
+ <li value="4">4</li>
+</ol>
+
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol.html
new file mode 100644
index 0000000000..0f380bf058
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-in-ol.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Check if SUMMARY has 'counter-increment: list-item 0'</title>
+<link rel="match" href="summary-in-ol-ref.html">
+
+<ol>
+ <details><summary>summary</summary></details>
+ <li>1</li>
+ <li>2 <details><summary>summary</summary></details></li>
+ <li>3</li>
+ <details><summary>summary</summary></details>
+ <li>4</li>
+</ol>
+
+<ol>
+ <summary>summary</summary>
+ <li>1</li>
+ <li>2 <summary>summary</summary></li>
+ <li>3</li>
+ <summary>summary</summary>
+ <li>4</li>
+</ol>
+
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration-ref.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration-ref.html
new file mode 100644
index 0000000000..ffdcfd25fb
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration-ref.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<title>Test reference</title>
+<style>
+div {
+ display: list-item;
+ list-style-type: disclosure-closed;
+ list-style-position: inside;
+ text-decoration: underline;
+}
+</style>
+<div>This text should be underlined.</div>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration.html b/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration.html
new file mode 100644
index 0000000000..80bbd44c46
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/summary-text-decoration.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<title>Rendering of summary element with text-decoration</title>
+<link rel="match" href="summary-text-decoration-ref.html">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements">
+<meta name="assert" content="Checks that text-decoration applies to rendered summary element.">
+<style>
+ summary { text-decoration: underline; }
+</style>
+<details>
+ <summary>This text should be underlined.</summary>
+</details>
diff --git a/testing/web-platform/tests/html/rendering/the-details-element/two-summaries-removal-crash.html b/testing/web-platform/tests/html/rendering/the-details-element/two-summaries-removal-crash.html
new file mode 100644
index 0000000000..164d3f16aa
--- /dev/null
+++ b/testing/web-platform/tests/html/rendering/the-details-element/two-summaries-removal-crash.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel="help" href="https://crbug.com/1216804">
+<meta name="assert" content="The renderer should not crash.">
+
+<details id="details" open>
+ <summary></summary>
+ <summary>
+ <details></details>
+ </summary>
+</details>
+
+<script>
+details.appendChild(document.createElement("frame"));
+details.innerText="";
+</script>