LayoutTests/spatial-css/spatial-portal-scroll-to-load.html

<!DOCTYPE html> <!-- webkit-test-runner [ SpatialPortalEnabled=true ModelElementEnabled=true ModelProcessEnabled=true allowTestOnlyIPC=true ] -->
<html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="../resources/ui-helper.js"></script>
<style>
    .spacer { height: 500vh; }
    #portal { spatial: portal; width: 300px; height: 150px; }
</style>
<body>
<div class="spacer"></div>
<div id="portal"></div>
<script>
'use strict';

promise_test(async t => {
    const portal = document.getElementById("portal");

    const model = document.createElement("model");
    t.add_cleanup(() => model.remove());
    portal.appendChild(model);
    const source = document.createElement("source");
    source.src = "../model-element/resources/cube.usdz";
    model.appendChild(source);

    await UIHelper.ensureStablePresentationUpdate();
    assert_not_equals(internals.modelElementState(model), "Loaded", "portal does not load its model while off-screen");

    portal.scrollIntoView();
    await model.ready;
    assert_equals(internals.modelElementState(model), "Loaded", "portal loads the model after scrolling into view");
}, "A <model> in a spatial portal loads only once the portal is scrolled into view");
</script>
</body>
</html>