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+++ This bug was initially created as a clone of Bug #26658 +++ Related to Bug 13403. readonly attribute WindowProxy parent; should be [Replaceable] readonly attribute WindowProxy parent; to match behavior already visible in Chrome/Firefox. The latest IE will be changing to match this behavior as well for compatibility with web sites, for example: http://mrdoob.github.io/three.js/examples/webgl_particles_shapes.html