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NancyLebovitz comments on Rationality Quotes September 2013 - Less Wrong
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What's the difference between a mouseover and an alt text?
Mouseover is javascript EDIT: or CSS and shows up when you hover your pointer over some trigger area. Alt text is plain HTML and shows up when the image (or whatever it is alt text for) doesn't load.
How do you get alt text to appear if the image loads? Read source?
Yup.
There's also title text (often called a tool tip) which appears when you hover the mouse over an image, but is a plain HTML feature.
No, mouseover is TITLE= and alt text ls ALT=. Mouseover doesn't rely on Javascript. Alt text is specifically for putting in place of an image; it used to be used for mouseovers as well, but then TITLE= came in for that.
Javascript is not actually required. CSS handles it.