As part of bug22441 and bug22564, we have added this assertion to HTML elements. For consistency, we should add it to other elements (SVG and WML mainly when writing this bug).
Created attachment 92744 [details] Patch
Comment on attachment 92744 [details] Patch Attachment 92744 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/8645343
Created attachment 92748 [details] Patch
Comment on attachment 92748 [details] Patch Attachment 92748 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/8653372
Created attachment 92749 [details] Patch
Comment on attachment 92749 [details] Patch r=me