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All browsers I've tested have pre.width being a long instead of an unsigned long, the only exception being Firefox. I do not see any reason why the spec requests Gecko's behavior for an obsoleted feature. We should probably have pre.width being a long in the specs. Gecko will follow.
Simple test case: open the URL, if the alert shows '0' pre.width is an unsigned long. If it shows '-1', it's a long.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: see diff given below Rationale: If you're gonna change this, LGTM.
Checked in as WHATWG revision r6706. Check-in comment: Compat with other browsers. http://html5.org/tools/web-apps-tracker?from=6705&to=6706