length-attribute.window.js

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/the-window-object/length-attribute.window.html - WPT Dashboard Interop Dashboard

async_test(t => {

  const frame = document.createElement("iframe");

  frame.srcdoc = "<iframe name=x srcdoc='<iframe name=z></iframe>'></iframe><iframe name=y></iframe>";

  frame.onload = t.step_func_done(() => {

    const frameW = frame.contentWindow;

    assert_equals(frameW.length, 2);

    assert_not_equals(frameW.x, undefined);

    assert_not_equals(frameW.y, undefined);

    assert_equals(frameW.z, undefined);

    assert_equals(frameW.x, frameW[0]);

    assert_equals(frameW.y, frameW[1]);

    const xFrameW = frameW.x;

    assert_equals(xFrameW.length, 1);

    assert_not_equals(xFrameW.z, undefined);

    assert_equals(xFrameW.z, xFrameW[0]);

    frame.remove();

    assert_equals(frameW.length, 0);

    assert_equals(frameW.x, undefined);

    assert_equals(frameW[0], undefined);

    assert_equals(xFrameW.length, 0);

    assert_equals(xFrameW.z, undefined);

});

  document.body.append(frame);

}, "Window object's length IDL attribute (and named access)");