html What does the optgroup label mean? Regarding the usage and attribute instance analysis of the html optgroup tag, this article introduces the definition and attribute examples of the html optgroup tag, as well as the usage of the html optgroup tag
html optgroup tag Definition and usage:
The optgroup element is used to group options. When you work with a long list of options, grouping related options can make things easier.
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Group related options together through the
Required attributes of the html optgroup label:
label: text: Specifies a description for the option group. (Example above)
html Optional attributes of the optgroup tag:
disabled: disabled: Specifies that the option group is disabled.
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The disabled attribute definition of the optgroup tag:
The disabled attribute stipulates that it is disabled This option group. Disabled option groups are neither available nor clickable.
You can set the disabled attribute to restore the user's use of the option group until certain conditions are met (such as selecting a check box). You can then use JavaScript to clear the disabled attribute so that the option group becomes available.
Disabled attribute example of optgroup tag
A disabled option group:
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html The usage of the optgroup tag is grouped, read-only and displayed in a tree style:
Browser support
All major browsers support the