[Webkit-unassigned] [Bug 197229] Visited link hash should be computed only once

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197229

--- Comment #15 from Geoffrey Garen <ggaren at apple.com> ---
We believe the user experience won't change because we believe that non-attacker pages don't reassign the href value after rendering a link element. If we're right, this policy is the clearest, and maybe even the easiest to specify in the future.

The most likely failure mode we've imagined is a page where all the links turn purple because they start out as href="" and then JavaScript fills in non-empty href values later. ("" is considered visited because it resolves to the current page.)

If we do find pages with links that start out with href="a.html" and change to href="b.html", alternatives we've discussed are: (a) throttle style changes triggered by href changes using a timer; (b) unconditionally force a full style recalc for all href changes, even if nothing has changed.

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