Source/WebCore/testing/FakeXRViewInit.idl

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// This represents the native resolution of the device, but may not reflect the viewport exposed to the page.
// https://immersive-web.github.io/webxr/#xrviewport
[
    EnabledAtRuntime=WebXR,
    Conditional=WEBXR,
] dictionary FakeXRDeviceResolution {
    required long width;
    required long height;
};

// A set of 4 angles which describe the view from a center point, units are degrees.
[
    EnabledAtRuntime=WebXR,
    Conditional=WEBXR,
] dictionary FakeXRFieldOfViewInit {
    required float upDegrees;
    required float downDegrees;
    required float leftDegrees;
    required float rightDegrees;
};

// https://immersive-web.github.io/webxr/#xrview
[
    EnabledAtRuntime=WebXR,
    Conditional=WEBXR,
] dictionary FakeXRViewInit {
    required XREye eye;
    // https://immersive-web.github.io/webxr/#view-projection-matrix
    required sequence<float> projectionMatrix;
    // https://immersive-web.github.io/webxr/#dom-xrwebgllayer-getviewport
    required FakeXRDeviceResolution resolution;
    // https://immersive-web.github.io/webxr/#view-offset
    // This is the origin of the view in the viewer space. In other words, this is
    // a transform from the view space to the viewer space.
    required FakeXRRigidTransformInit viewOffset;
    // This is an optional means of specifying a decomposed form of the projection
    // matrix.  If specified, the projectionMatrix should be ignored.
    // Any test that wishes to test clip planes or similar features that would require
    // decomposing/recomposing the projectionMatrix should use this instead of
    // the projection matrix.
    FakeXRFieldOfViewInit fieldOfView;
};