What is the role and history of the $content_width global variable?

I believe it was added back on WordPress 2.6 (maybe 2.5). It’s there to allow you to set a maximum width on images being displayed as content in your theme. E.g. If your main content area is only 475px wide, you could set $content_width = 450 to make sure your image doesn’t break out of your main content area.

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