What is the function of the question mark after the external CSS file name? css question mark

What is the function of the question mark after the external CSS file name? css question mark

What is the function of the question mark after the externally introduced CSS file name:

When you look at the code on the webpage, you may find a question mark after the name of an external CSS file introduced by the <link> tag, and the question mark is generally followed by eight messy characters, the same is true for this site, as shown below:

Maybe the characters after the question mark have a special meaning. In fact, this is not the case. It can be changed to any character, just like a version number of the CSS file, for example, after a webpage is accessed, the original CSS style may exist in the cache. Although the server's CSS file may have been updated, the browser cannot be updated, if you add question marks and subsequent characters, you can promptly update the CSS style of the webpage.

Original address: http://www.51texiao.cn/div_cssjiaocheng/2015/0504/722.html

The original address is: http://www.softwhy.com/forum.php? Mod = viewthread & tid = 4642.