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Forum Moderators: ergophobe
Not specifying the dimensions will cause the content to shift around as images are being loaded, which is quite annoying. It is especially annoying for those who have already begun reading the page.
Matt
Define "certain movement" and "problems" in reference to "some users".
I'm not referring to Flicker or Strobe effects. Just movement in general on the page. Whether it be images loading in their placeholders, an animated gif, a Flash movie, basically anything that has movement. We're talking a very small percentage of users who may be affected by these.
Think cognitive disabilities.