test_load_no_preload.html

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<html>

<head>

  <title>Test load on no preload element</title>

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

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

  <script type="text/javascript" src="manifest.js"></script>

</head>

<body>

<script class="testbody" type="text/javascript">

// This test checks the scenario where the `canplaythrough` event is fired

// after calling load() on an element that does not have a preload attribute.

//

// The spec does not define how much data should be loaded in this case —

// the behavior is left to the user agent.

//

// This behavior can be reconsidered once bug 1969224 is resolved.

add_task(async function testLoadOnNoPreloadElement() {

  for (let test of gSmallTests) {

    let tag;

    if (test.type.startsWith("audio/")) {

      tag = "audio";

    } else if (test.type.startsWith("video/")) {

      tag = "video";

    } else {

      tag = "unknown";

    info(`run ${test.name}, type=${test.type}, tag=${tag}`);

    let ele = document.createElement(tag);

    if (typeof ele.canPlayType != "function" || !ele.canPlayType(test.type)) {

      // Skip unsupported files.

      continue;

    ele.src = test.name;

    ele.load();

    info(`load an element without preload attribute should fire a canplaythrough`);

    await once(ele, "canplaythrough");

    ok(true, `${test.name} fired 'canplaythrough' event`);

    removeNodeAndSource(ele);

});

</script>

</body>

</html>