toBlob.null.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-canvas-element/toBlob.null.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>Canvas test: toBlob.null</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/html/canvas/resources/canvas-tests.js"></script>

<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">

<body class="show_output">

<h1>toBlob.null</h1>

<p class="desc">toBlob with zero dimension returns a null Blob</p>

<p class="output">Actual output:</p>

<canvas id="c" class="output" width="100" height="0"><p class="fallback">FAIL (fallback content)</p></canvas>

<ul id="d"></ul>

<script>

async_test(function() {

    on_event(window, "load", this.step_func(function() {

         var toBlobCalled = false;

         c.toBlob(this.step_func(function(blob) {

           toBlobCalled = true;

           _assertSame(blob, null, "blob", "null");

           c.width = 0;

           c.height = 100;

           c.toBlob(this.step_func_done(function(blob) {

             _assertSame(blob, null, "blob", "null");

           }), 'image/jpeg');

         }), 'image/jpeg');

         assert_false(toBlobCalled, "toBlob callback shouldn't be called synchronously");

    }));

}, "toBlob with zero dimension returns a null Blob");

</script>