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I know in CSS we use /* */ for comment text . But I see in some CSS use /*! some url or text */.
What's different between /* text */ and /*! text */ ?
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How to Comment in CSS. To comment in CSS, simply place your plain text inside /* */ marks. This tells the browser that they are notes and should not be rendered on the front end.
Comments in CSS can be added by using the /* tag, which is then closed off by using */ . Note: Code that is commented out is not used to style the page. This technique can be used to add both single and multi-line comments.
The exclamation mark is to keep an comment important . This comment will not be deleted while compressing. This is important e.g. for keep a licence in a CSS file after compressing. Uglify or YUICompressor will keep that comment after compressing.
/*! important comment will not be deleted while compressing */
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