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<!DOCTYPE html>
<title>CSS Values and Units Test: sibling-index() changing font-palette during @keyframes animation</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#tree-counting">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@font-face {
font-family: "COLR-test-font";
src: url("resources/COLR-palettes-test-font.ttf") format("truetype");
}
@font-palette-values --MyFirstPalette {
font-family: "COLR-test-font";
base-palette: 1;
}
@font-palette-values --MySecondPalette {
font-family: "COLR-test-font";
base-palette: 2;
}
@keyframes --anim {
from {
font-palette: palette-mix(in lch, --MyFirstPalette calc(5% * sibling-index()), --MySecondPalette 80%);
}
to {
font-palette: palette-mix(in lch, --MyFirstPalette 90%, --MySecondPalette 10%);
}
}
#target {
animation: --anim 1000s step-end;
}
</style>
<div>
<div id="rm"></div>
<div></div>
<div></div>
<div id="target"></div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).fontPalette, "palette-mix(in lch, --MyFirstPalette 20%, --MySecondPalette)");
}, "Initially, the sibling-index() is 4 for #target");
test(() => {
rm.remove();
assert_equals(getComputedStyle(target).fontPalette, "palette-mix(in lch, --MyFirstPalette 15%, --MySecondPalette 80%)");
}, "Removing a preceding sibling of #target reduces the sibling-index()");
</script>
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