Yahoo's tips for speeding up sites. "iPhone won't cache components bigger than 25K" - I didn't know that.
That empty img src="" finding is really strange!
Yep, interesting, and another "I never knew that" moment:
[HTML5] The src attribute must be present, and must contain a valid URL referencing a non-interactive, optionally animated, image resource that is neither paged nor scripted. If the base URI of the element is the same as the document's address, then the src attribute's value must not be the empty string.
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