1 files changed, 32 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/element/manual/filters/svg-filter-lh-rlh.html b/testing/web-platform/tests/html/canvas/element/manual/filters/svg-filter-lh-rlh.html
new file mode 100644
index 0000000000..b61193fb9f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/element/manual/filters/svg-filter-lh-rlh.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html class="test-wait">
+<title>HTML Canvas test: SVG filter using CSS font-relative line-height units</title>
+<link rel="match" href="svg-filter-lh-rlh-expected.html"/>
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+:root {
+  font: 20px Ahem;
+}
+</style>
+<svg width="0" height="0">
+  <!-- https://html.spec.whatwg.org/multipage/canvas.html#working-with-externally-defined-svg-filters -->
+  <use href="./svg-filter.svg#filter-lh" />
+  <use href="./svg-filter.svg#filter-rlh" />
+</svg
+><canvas id="canvas-lh" width="100" height="100"></canvas><br
+><canvas id="canvas-rlh" width="100" height="100"></canvas>
+<script>
+function use_filter(canvas, filter_id) {
+  const ctx = canvas.getContext("2d");
+  ctx.font = "40px Ahem";
+  ctx.filter = `url(./svg-filter.svg#${filter_id})`;
+  ctx.fillStyle = "red";
+  ctx.fillRect(0, 0, 100, 100);
+}
+window.addEventListener("load", async () => {
+  use_filter(document.getElementById("canvas-lh"), "filter-lh");
+  use_filter(document.getElementById("canvas-rlh"), "filter-rlh");
+  document.documentElement.classList.remove('test-wait');
+});
+</script>
+</html>