LayoutTests/accessibility/mac/primary-screen-height-iframe.html

<!DOCTYPE HTML>
<html>
<head>
<script src="../../resources/accessibility-helper.js"></script>
<script src="../../resources/js-test.js"></script>
</head>
<body>

<div id="container"></div>

<script>
window.jsTestIsAsync = true;

var output = "This test ensures AXPrimaryScreenHeight is non-zero for an iframe whose accessibility tree is built after accessibility is already active (a height of 0 mirrors elements vertically).\n\n";

function checkPrimaryScreenHeight(element, label) {
    return new Promise((resolve) => {
        element.attributeValueAsync("_AXPrimaryScreenHeight", (value) => {
            if (value > 0)
                output += `PASS: ${label} AXPrimaryScreenHeight is > 0.\n`;
            else
                output += `FAIL: ${label} AXPrimaryScreenHeight should be > 0 but was ${value}.\n`;
            resolve();
        });
    });
}

window.addEventListener("load", () => {
    setTimeout(async () => {
        if (!window.accessibilityController) {
            finishJSTest();
            return;
        }

        // Touch the main tree so the web process transitions to isolated-tree (AXThread) mode. Any
        // AXObjectCache constructed after this point arms its build timer in its constructor, so the
        // iframe we insert below gets its isolated tree built via that timer (the previously-broken path).
        const root = accessibilityController.rootElement;
        await waitForFrameGeometryReady();
        await checkPrimaryScreenHeight(root, "Main-frame root element");

        // Now insert the iframe. Because AXThread mode is already active, its cache builds the isolated
        // tree via the constructor's build timer -> AXIsolatedTree::create(), not getOrCreateIsolatedTree().
        document.getElementById("container").innerHTML =
            "<iframe id='iframe' src=\"data:text/html,<body><h1 id='target'>Iframe heading</h1></body>\"></iframe>";

        // Wait for the iframe's isolated tree and frame geometry to be built, then read
        // AXPrimaryScreenHeight from an element inside it. It must be > 0.
        const target = await waitForIframeAccessibilityReady("container", "target");
        if (!target)
            output += "FAIL: could not find the iframe's target element in the accessibility tree.\n";
        else
            await checkPrimaryScreenHeight(target, "Iframe descendant element");

        debug(output);
        finishJSTest();
    }, 0);
});
</script>
</body>
</html>