<!DOCTYPE html><!-- webkit-test-runner [ ModelElementEnabled=true ] -->
<html>
<body>
<model id="model">
    <source src="resources/heart.usdz">
</model>
<pre id="layers"></pre>
<script>
    window.testRunner?.waitUntilDone();
    window.testRunner?.dumpAsText();

    const layers = document.getElementById("layers");
    const source = document.querySelector("source");
    const model = document.getElementById("model");

    const modelDidLoadFirstSource = () => {
        layers.textContent = "Before Changing Source:\n";
        layers.textContent += window.internals?.platformLayerTreeAsText(model, window.internals.PLATFORM_LAYER_TREE_INCLUDE_MODELS) ?? "This test requires testRunner.";

        model.addEventListener("load", event => {
            layers.textContent += "After Changing Source:\n";
            layers.textContent += window.internals?.platformLayerTreeAsText(model, window.internals.PLATFORM_LAYER_TREE_INCLUDE_MODELS) ?? "This test requires testRunner.";
            window.testRunner?.notifyDone();
        }, { once: true });

        model.addEventListener("error", event => {
            layers.textContent = `Failed. Second model did not load.`;
            window.testRunner?.notifyDone();
        }, { once: true });

        source.src = "resources/cube.usdz";
    }

    if (model.complete)
        modelDidLoadFirstSource();
    else {
        model.addEventListener("load", modelDidLoadFirstSource, { once: true });
        model.addEventListener("error", event => {
            layers.textContent = `Failed. First model did not load.`;
            window.testRunner?.notifyDone();
        }, { once: true });
    }
</script>
</body>
</html>