Does html5 support boolean value attributes?

html5 supports boolean value attributes; boolean value attributes refer to attributes whose value is true or false, such as the disabled attribute in the input element. If this attribute is not used, it means that the value is false. If the element is not disabled, use this attribute. You can not set the attribute value to indicate that the value is true and disable the element.

The operating environment of this article: Windows 10 system, html5 version, Dell G3 computer.

Does html5 support boolean value attributes?

html5 supports boolean value attributes

There are some attributes of elements in html. When only writing the attribute name, When the attribute value is not specified, the table evaluates the attribute value to true. If the attribute value is set to false, the attribute is not used. In addition, when you want to set the attribute value to true, you can also set the attribute name as the attribute value, or set an empty string as the attribute value. For example, disabled and readonly in the input element are such attributes.

Attributes of Boolean type in html:

1, noshade

is used to represent Whether there is a shadow, mostly used in the

---

tag

2, cecked

is used to indicate whether it is selected by default, mostly used for radio buttons< input type="radio" /> and multi-select button , it should be noted that the same name needs to be used in To achieve the effect of a radio button

3, selected

is used to indicate whether to display priority, and is used for drop-down forms and only

4 in the drop-down form

is used to automatically obtain focus, and is used in the tag with an input box

5. readonly

Read-only attribute, which can get focus and the data will be passed to the background. It is suitable for text boxes that can be input, such as text

6. disabled

Disable the attribute so that it cannot obtain focus and the data cannot be passed to the background. You can use

7 in input text and buttons. 7. require

is used to indicate that selection is required, mostly used in the tag

Recommended tutorial: "html video tutorial"

The above is the detailed content of Does html5 support boolean value attributes?. For more information, please follow other related articles on the PHP Chinese website!