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If grouping the front-end code helps reduce the number of requests, why not more websites written on one html document?

I suppose I ask that if grouping JavaScript is considered good practice, why do not more sites put JavaScript and CSS directly in the same HTML document?

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why do not more sites put JavaScript and CSS directly into one HTML document.

Individual file caching.

  • External files have the advantage of caching. Since scripts and styles rarely change (static) and / or are shared between pages, it’s better to simply separate them from the page, making the page easier.

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They separated them so that multiple web pages could use the same file. When you change a single file, you can also refresh multiple pages. In addition, a large HTML file will be uploaded for a long time.

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