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selection-background-painting-order.html
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selection-background-painting-order.html
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<!doctype html>
<meta charset="utf-8">
<!-- see “Selection regression tests” in README.md -->
<title>CSS Pseudo-Elements Test: ::selection background always paints over unselected parts when selecting text</title>
<link rel="author" name="Delan Azabani" href="mailto:dazabani@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-painting">
<link rel="help" href="https://drafts.csswg.org/css-text-decor-4/#painting">
<link rel="help" href="https://www.w3.org/TR/CSS22/zindex.html#painting-order">
<link rel="match" href="selection-background-painting-order-ref1.html">
<link rel="match" href="selection-background-painting-order-ref2.html">
<meta name="assert" value="This test verifies that when selecting text, the ::selection background always paints over unselected parts.">
<script src="support/selections.js"></script>
<link rel="stylesheet" href="support/highlights.css">
<style>
@font-face {
font-family: CSSTest;
src: url(/fonts/CSSTest/csstest-basic-italic.ttf);
}
main {
font: 80px/1 CSSTest;
margin: 0.5em;
width: min-content;
}
main > span {
background: black;
color: orange;
}
main > span::selection {
/*
Safari on macOS: opaque selection backgrounds are made
translucent in the used value, so we need to choose a
background color with known but non-opaque alpha.
*/
background: #0000FFC0;
color: transparent;
}
</style>
<p>Test passes if the blue rectangle below contains no proper orange, only orange dimmed by blue.
<main class="highlight_reftest"><span>ii∫∫∫</span></main>
<script>
const target = document.querySelector("main > span");
selectRangeWith(range => {
range.selectNodeContents(target);
range.setStart(target.childNodes[0], 0);
range.setEnd(target.childNodes[0], 3);
});
</script>