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Youtube is, obviously, a very large, high-traffic website with top-of-the-line Google developers working on it. When I click "show the comment", if the comment replied to has been deleted, an alert pops up saying "this comment no longer exists". The alert is done with the generic built-in javascript function "alert". Why haven't they written a custom alert script? The alert box is completely out of line with the rest of the Youtube design and seems like a terrible UX choice.

Are there any reasons they might do this?

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not reinventing the wheel. If something works, don't change it. Their pages are already heavy enough to add more bytes. May be. – PatomaS Nov 1 '12 at 1:19
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There's no way to answer this without being Google. – Rahul♦ Nov 1 '12 at 12:19

closed as not a real question by Rahul♦ Nov 1 '12 at 12:19

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