html - Do search engines process Javascript?

Question

According to this page it would seem like they don't, in the sense that they don't actually run it, but that page is 2 years old (judging from the copyright info).

The reason I'm asking this question is because we use Javascript to replace text on our site with other more typographically sound content. We're worried that this may affect the crawlability/seo of our sites, since generally what we're replacing is headers; ie. <h1>, <h2>, etc.

Will search engine bots see our original code, or will they run the Javascript and see the replaced text?

Answer 1

Search engines don't process JavaScript as such.

There is some evidence that Google may have started processing inline script content in some cases, in order to catch content that is entered into the page parse queue using document.write. However certainly DOM methods such as you might use for font-replacement are not affected and no onload code is invoked.