A brief discussion on tags in HTML

0. What is a tag?

Here checked, id, href, and title are tags.

1. Boolean flags

Checked as an example

Existence is application, used to mark the status,

If the flag is present, the value of getAttribute is always checked. If the flag is not present, the value of getAttribute is undefined.

By operating the value through setAttribute and removAttribute, it will act on the checked attribute, and the value of the checked attribute is true or false.

Assigning a value to the checked attribute will not have any effect on the checked flag.

2. Data labeling

Take title as an example

The value of the attribute title is always the same as the value of the tag title

The assignment of a value to the attribute title affects the existence (from nothing to something) and value of the tag title.

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