A brief discussion on tags in HTML

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0. What is a tag

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<input type="checkbox"  checked /><a href="http:www.php.cn" title="123" id="lol">提示</a>

The checked, id, href, and title here are tags

1.Boolean tag

Checked is used as an example.

It is applied when it exists. It is used to mark the status.

If there is a change mark, the value of getAttribute is always checked. If there is no getAttribute, The value is undefined.

The value is operated by setAttribute and removeAttribute, which will be applied to the attribute checked. The value of the attribute checked is true or false.

The assignment operation to the checked attribute will not have any impact on the checked tag

2. The data tag

has been titled For example

The value of the attribute title is always consistent with the value of the tag title

Assigning a value to the attribute title will affect the existence (from scratch) and value of the tag title

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