dom/base/test/test_anonymousContent_canvas.html
author jgilbert@mozilla.com <jgilbert@mozilla.com>
Wed, 23 Aug 2017 08:08:58 +0000
changeset 655214 3b44caaf117a567d2d55f3d6709685a7448ea255
parent 489814 a072d7934ff7c6fd2ad974d7abc0b08d11041aca
child 657897 3e55e4de032f16f2e6cda431c602d600f2d87f75
permissions -rw-r--r--
Bug 1322746 - dom/base/test/test_anonymousContent_canvas.html should not assume webgl works. - r=daoshengmu MozReview-Commit-ID: 60PrRqA7Nth

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1212477
-->
<head>
  <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 type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
  <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 type="application/javascript">
    let chromeDocument = SpecialPowers.wrap(document);
    let testElement = document.querySelector("div");

    let anonymousContent = chromeDocument.insertAnonymousContent(testElement);

    is(anonymousContent.getCanvasContext("id", "2d"), null,
        "Context is null for non-canvas elements");

    let context2d = anonymousContent.getCanvasContext("canvas2d", "2d");

    is(context2d.toString(), "[object CanvasRenderingContext2D]",
        "2D Context is returned properly");

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

    is (anonymousContent.getCanvasContext("canvas-foo", "foo"), null,
        "Context is null for unknown context type");

    SimpleTest.doesThrow(
      () => anonymousContent.getCanvasContext("foo", "2d"),
      "NS_ERROR_NOT_AVAILABLE",
      "Get a context using unexisting id should throw"
    );

    const normalWebGL = document.createElement('canvas').getContext('webgl');
    if (normalWebGL) {
      let webgl = anonymousContent.getCanvasContext("canvas-webgl", "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>
</body>
</html>