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Test Info:

<!doctype html>
<title>Test for bug 1489139: Unbound generated content in the active chain</title>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<style>
#target, #target::before {
width: 200px;
height: 200px;
}
#target::before {
content: " ";
display: block;
background: green;
}
#target:active::before {
content: "";
background: red;
}
</style>
Should see a green square after clicking.
<div id="target"></div>
<script>
SimpleTest.waitForExplicitFinish();
onload = function() {
let target = document.getElementById("target");
requestAnimationFrame(() => {
synthesizeMouseAtPoint(100, 100, { type: "mousedown" })
ok(target.matches(":active"), "Should have been clicked");
requestAnimationFrame(() => {
synthesizeMouseAtPoint(100, 100, { type: "mouseup" })
ok(!target.matches(':active'), "Should stop matching :active afterwards");
SimpleTest.finish();
});
});
}
</script>