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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
Making this a higher priority to actively seek more feedback on from implementers and webdevs.
HTML5.1 Bugzilla Bug Triage: Fixed, this seems fixed in the lastest draft. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!