unclosed-layers.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/manual/layers/unclosed-layers.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html class="reftest-wait">

<link rel="match" href="unclosed-layers-expected.html">

<title>Canvas test: unclosed-layers</title>

<h1>unclosed-layers</h1>

<p class="desc">Check that unclosed layers aren't rendered.</p>

<canvas id="canvas" width="1" height="1">

  <p class="fallback">FAIL (fallback content)</p>

</canvas>

<script>

  var placeholder = document.getElementById('canvas');

  var offscreen = placeholder.transferControlToOffscreen();

  const ctx = offscreen.getContext('2d');

  offscreen.width = offscreen.height = 200;

  ctx.fillStyle = 'purple';

  ctx.fillRect(60, 60, 75, 50);

  ctx.beginLayer({filter: {name: 'dropShadow', dx: -2, dy: 2}});

  ctx.fillRect(40, 40, 75, 50);

  ctx.fillStyle = 'grey';

  ctx.fillRect(50, 50, 75, 50);

  function draw () {

    // Wait until frame propagates.

    if(placeholder.width != 200) {

      requestAnimationFrame(draw);

    } else {

      document.documentElement.classList.remove("reftest-wait");

  requestAnimationFrame(draw);

</script>