html - GET variable for css files? -

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i've noticed sites when link css pass appears variable in addition link, example http://html5boilerplate.com html template, ?v=2

<link rel="stylesheet" href="css/style.css?v=2">

is flag server rewrite or more?

some sites may use route specific css files, however, without knowing specific site referring to:

in event css file changes, provides easy way reset browser cache on clients computers. changing v=2 v=3.


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