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I was looking for answers but I can not find anywhere. Why are placed version of the font in a CSS file? It is regulated by a specification?

Below is an example (example comes from: https://github.com/FontFaceKit/open-sans):

/* BEGIN Light */
@font-face {
  font-family: 'Open Sans';
  src: url("./fonts/Light/OpenSans-Light.eot?v=1.1.0");
  src: url("./fonts/Light/OpenSans-Light.eot?#iefix&v=1.1.0") format("embedded-opentype"), url("./fonts/Light/OpenSans-Light.woff2?v=1.1.0") format("woff2"), url("./fonts/Light/OpenSans-Light.woff?v=1.1.0") format("woff"), url("./fonts/Light/OpenSans-Light.ttf?v=1.1.0") format("truetype"), url("./fonts/Light/OpenSans-Light.svg?v=1.1.0#Light") format("svg");
  font-weight: 300;
  font-style: normal; }
/* END Light */
Peter
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  • [Here's the specification](https://drafts.csswg.org/css-fonts-3/#font-face-rule). I don't see anything about a version. It's probably something about [cache-busting](http://stackoverflow.com/q/9692665/215552) – Heretic Monkey Jul 15 '16 at 20:56
  • He fooled me the letter "V" - I thought this is version. Thanks for the explanation Mike. – Peter Jul 15 '16 at 21:08

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