Open DevTools, go to Profiles, take a heap snapshot, open it. Now try to show color legends popup by pressing the '?' button on the status bar of a snapshot view. Expected: a popup is shown. Actual: button disappears, "Uncaught TypeError: Cannot call method 'offsetRelativeToWindow' of undefined", source: chrome-devtools://devtools/Popover.js (116) in the console.
Created attachment 109884 [details] Patch
Manually committed http://trac.webkit.org/changeset/96812: Web Inspector: [Chromium] Heap Snapshot colors legend help popup is not shown. https://bugs.webkit.org/show_bug.cgi?id=69482 Reviewed by Yury Semikhatsky. * inspector/front-end/DetailedHeapshotView.js: (WebInspector.DetailedHeapshotView.prototype._helpClicked):