Wow, that dominator tree algorithm I wrote as an intern (https://bugzilla.mozilla.org/show_bug.cgi?id=666426) seems to have lasted 13 years! At the time we assumed that graphs would be small enough to not warrant the constant factor against Lengauer-Tarjan. ...And of course, browser-based apps have gotten much bigger since then.
Semi-NCA hadn't even been published yet and seems like the clear choice nowadays, so I'm glad to see it in place! Great work!
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