Should the attributes of HTML be enclosed in quotation marks?

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In HTML, you may not need to quote attribute values, but in XHTML, they must be in quotation marks. For example:

Must be modified to:

Html, the full name of html, 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, sounds, tables, links, etc. Mainly used with css+js to build elegant front-end web pages.

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