How does HTML determine whether the framework is supported or not

Editor to share with you how HTML determines whether to support the framework, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Determine whether your browser does not support frames. What is frame html? the full name of html is Hypertext markup language, which is a markup language that contains a series of tags. Through these tags, you can unify the format of documents on the network and connect scattered Internet resources into a logical whole. Html text is a descriptive text composed of html commands, and html commands can explain text. Graphics, animation, sound, tables, links, etc., mainly used with css+js to build elegant front-end web pages.

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