What are the specifications of the code in HTML

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HTML tags are not case sensitive and lowercase is recommended. Such as:,

HTML tag attributes are optional. Some tags have no attributes, such as:,

The content of the double tag is between the start and end tags, and the single tag has no content.

HTML tags can be nested with each other, but be careful to nest sequentially, with outer layer and inner layer, one layer at a time.

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