What does it mean to add a question mark (?) after the CSS link address?
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For example: <link rel="stylesheet" href="http://static.ak.facebook.com/css/actionspro.css?44:72882" type="text/css"/> The CSS links on Facebook are followed by a parameter. What does this mean? It can be regarded as a version number of CSS. If the CSS has been changed, and you are worried that the local CSS file in the browser has not been updated in time, resulting in the page not showing the corresponding effect, you can modify this? The number behind it is used to make the browser re-download the latest CSS document! |
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