Blame layout/reftests/css-transitions/style-change-during-transition.html

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<html class="reftest-wait">
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<style>
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.container {
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  visibility: visible;
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  transition: visibility .2s;
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}
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.hidden {
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  visibility: hidden;
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}
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</style>
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      Text
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<script>
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window.addEventListener("load", () => {
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  requestIdleCallback(() => {
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    tooltip.classList.remove("hidden");
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    requestAnimationFrame(() => {
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      requestAnimationFrame(() => {
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        tooltip.style.zIndex = 2;
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        document.documentElement.classList.remove("reftest-wait");
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      });
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    });
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  });
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});
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</script>