Some content on some web pages is only displayed with Javascript when a button is clicked (for example). We know that Google executes Javascript and is (very likely) to find this content, but what about Bing? Do Bing web crawlers execute Javascript too?
Does Bing execute Javascript when crawling and indexing web pages (like Google)?
javascript;web crawlers;indexing;bing
According to this we are still waiting to see what Bing will do, so I would assume (I know) not. Here is an excerpt regarding Bing:What Can We Expect?Googles disregard for JavaScript in the past has also been used by  many websites to their advantage. It will be important to understand  the repercussions of Google being able to index all of the content and  assets on your pages, as it will be able to see your pages as a user  can now.This announcement creates more questions than it answers, especially  considering the versatility and expanding capabilities of JavaScript.  We dont truly know what Googles goals are for this update, but RKG  is formulating testing to better understand the ramifications.A few scenarios to think about:Is your site is hiding duplicate content behind JavaScript, perhaps by  a review aggregator, will Googlebot now crawl all of that duplicate  content?Will all JavaScript links in  tags or JavaScript jump menus from  forms suddenly count as links?How will faceted navigation within JavaScript be interpreted?Will the execution of JavaScript by Googlebot be in small, incremental  waves or  will this new capability be a fire-hose that is simply  turned on?How will Bing respond?Do the crawlers that you use internally for your own site analysis  have the ability to execute JavaScript?  Will they no longer be able  to mimic Googlebot?