Highlight API: Add test coverage

These tests are meant to verify that: - UAs must not define any styles for custom highlight pseudo-elements in the default UA stylesheet. - A custom highlight pseudo-element inherits the styles of its originating element. See https://drafts.csswg.org/css-highlight-api-1/#default-styles Bug: 1164461 Change-Id: I955f39ee185fe2282d7599c07ff1cdd7df2d7059 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3273351 Commit-Queue: Fernando Fiori <[email protected]> Reviewed-by: Dan Clark <[email protected]> Cr-Commit-Position: refs/heads/main@{#944166}
web-platform-tests · Apr 17, 2023 · 1468666 · 1468666
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diff --git a/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-001-ref.html b/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-001-ref.html
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+<!DOCTYPE html>
+<meta charset="UTF-8">
+<style>
+  body {
+    font-size: 3em;
+    font-weight: bolder;
+  }
+  #affected2 {
+    color: green;
+  }
+</style>
+<body><span>This should have default style (black).</span><span id="affected2">This should have 'highlight2' style (green).</span>
diff --git a/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-001.html b/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-001.html
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+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>CSS Highlight API Test: Overlapping Highlights</title>
+<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
+<link rel="match" href="custom-highlight-painting-overlapping-highlights-001-ref.html">
+<meta name="assert" value="UAs must not define any styles for custom highlight pseudo-elements in the default UA stylesheet.">
+<style>
+  body {
+    font-size: 3em;
+    font-weight: bolder;
+  }
+  #affected1::highlight(highlight1) {
+    color: red;
+  }
+  #affected2::highlight(highlight2) {
+    color: green;
+  }
+</style>
+<body><span id="affected1">This should have default style (black).</span><span id="affected2">This should have 'highlight2' style (green).</span>
+<script>
+  /*
+    This test is meant to verify that:
+      - UAs must not define any styles for custom highlight pseudo-elements in
+      the default UA stylesheet.
+      - A custom highlight pseudo-element inherits the styles of its originating
+      element.
+
+    In this test, highlight2 has higher priority because it was registered
+    later, so it is painted over highlight1. This includes painting for
+    span#affected1, where there is no CSS rule for highlight2. The result is
+    that highlight2 paints on top for span#affected1, using the originating
+    element's color. Thus it appears as if no highlight was painted at all for
+    span#affected1.
+
+    See https://drafts.csswg.org/css-highlight-api-1/#default-styles
+  */
+
+  const node = document.body;
+  let r = new Range();
+  r.setStart(node, 0);
+  r.setEnd(node, 2);
+
+  CSS.highlights.set("highlight1", new Highlight(r));
+  CSS.highlights.set("highlight2", new Highlight(r));
+</script>
diff --git a/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-002-ref.html b/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-002-ref.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<style>
+  div {
+      font-size: 3em;
+      font-weight: bolder;
+  }
+  #affected1 {
+    color: green;
+    background-color: rgb(0, 255, 0, 0.5);
+  }
+  #affected2 {
+    background-color: rgba(100, 0, 100, 0.5);
+  }
+</style>
+<body><div><span id="affected1">Green on lime.</span><span id="affected2">Black on maroon.</span></div>
diff --git a/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-002.html b/css/css-highlight-api/painting/custom-highlight-painting-overlapping-highlights-002.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>CSS Highlight API Test: Overlapping Highlights</title>
+<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
+<link rel="match" href="custom-highlight-painting-overlapping-highlights-002-ref.html">
+<meta name="assert" value="UAs must not define any styles for custom highlight pseudo-elements in the default UA stylesheet.">
+<style>
+  div {
+      font-size: 3em;
+      font-weight: bolder;
+  }
+  #affected1::highlight(highlight1) {
+    color: green;
+    background-color: rgb(0, 255, 0, 0.5);
+  }
+  #affected2::highlight(highlight2) {
+    color: red;
+    background-color: rgba(100, 0, 100, 0.5);
+  }
+</style>
+<body><div><span id="affected1">Green on lime.</span><span id="affected2">Black on maroon.</span></div>
+<script>
+  /*
+    This test is meant to verify that:
+      - UAs must not define any styles for custom highlight pseudo-elements in
+      the default UA stylesheet.
+      - A custom highlight pseudo-element inherits the styles of its originating
+      element.
+
+    In this test, highlight1 has higher priority, so it is painted over
+    highlight2. This includes painting for span#affected2, where there is no CSS
+    rule for highlight1. The result is that highlight1 paints on top for
+    span#affected2, using the originating element's color (black) and background
+    color (transparent). Thus, span#affected2 gets text color black, and the
+    background remains the same color as that applied by highlight2 (maroon).
+
+    See https://drafts.csswg.org/css-highlight-api-1/#default-styles
+  */
+
+  const div = document.querySelector("div");
+
+  let r = new Range();
+  r.setStart(div, 0);
+  r.setEnd(div, 2);
+  let r2 = new Range();
+  r2.setStart(div, 0);
+  r2.setEnd(div, 2);
+
+  let h = new Highlight(r);
+  h.priority = 3;
+  let h2 = new Highlight(r2);
+  h2.priority = 2;
+
+  CSS.highlights.set("highlight1", h);
+  CSS.highlights.set("highlight2", h2);
+</script>