WebAIM - Web Accessibility In Mind

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Re: Alt text / alternate image on embed (of QuicktimeVideo)

for

From: Roberts, Vern
Date: Apr 17, 2007 9:30AM

It's my understanding, in accessibility guidelines, when you're page
opens, do a check to see if the plugin exists and, if not, furnish a
link to the place where the plugin can be downloaded. EXAMPLE: for
javascript, use a hidden value that changes when the page loads, then do
a check of the new value. If it has not changed, javascript is probably
turned off, or possibly an older browser that doesn't do javascript. In
that case you would give instructions on how to enable javascript.

That being said, I'm not sure how to check for specific plugins.