test_anonymousContent_canvas.html

Enable keyboard shortcuts

<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1212477

-->

<meta charset="utf-8">

<title>Test for Bug 1212477 - Needs a way to access to &lt;canvas&gt;'s context (2d, webgl) from Anonymous Content API</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1212477">Mozilla Bug 1212477</a>

<div>

  <div id="id" class="test">text content</div>

  <canvas id="canvas2d"></canvas>

  <canvas id="canvas-webgl"></canvas>

  <canvas id="canvas-foo"></canvas>

</div>

<script>

  let chromeDocument = SpecialPowers.wrap(document);

  let testElement = document.querySelector("div");

  let anonymousContent = chromeDocument.insertAnonymousContent();

  anonymousContent.root.appendChild(testElement.cloneNode(true));

  let canvas2d = anonymousContent.root.getElementById("canvas2d");

  let context2d = canvas2d.getContext("2d");

  is(context2d.toString(), "[object CanvasRenderingContext2D]",

      "2D Context is returned properly");

  is(context2d.canvas, null, "context's canvas property");

  is(anonymousContent.root.getElementById("canvas-foo").getContext("foo"),

     null,

     "Context is null for unknown context type");

  const normalWebGL = document.createElement('canvas').getContext('webgl');

  if (normalWebGL) {

    let canvasWebGL = anonymousContent.root.getElementById("canvas-webgl");

    let webgl = canvasWebGL.getContext("webgl");

    is(webgl.toString(), "[object WebGLRenderingContext]",

        "WebGL Context is returned properly");

    is(webgl.canvas, null,

        "WebGL context's canvas property is null in anonymous content");

  chromeDocument.removeAnonymousContent(anonymousContent);

</script>