backdrop-filter-mask-image-while-loading.html

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This WPT test may be referenced by the following Test IDs:
- /css/css-masking/mask-image/backdrop-filter-mask-image-while-loading.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class="reftest-wait">

<meta charset="utf-8">

<title>Backdrop-filter with mask image remains hidden while loading</title>

<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-mask-image">

<link rel="match" href="about:blank">

<script src="/common/reftest-wait.js"></script>

<script src="/common/rendering-utils.js"></script>

<p id="target" style="backdrop-filter: invert(1); background-color: rgba(255, 255, 255, 0.5);">Backdrop-filter with

  a loading mask-image</p>

<script>

  onload = () => {

    const p = document.getElementById('target');

    p.style.maskImage = `url("support/transparent-100x50-blue-100x50.svg?pipe=trickle(d10)")`;

    waitForAtLeastOneFrame().then(takeScreenshot);

};

</script>