Disable a group of related form elements:
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The disabled attribute is supported in all major browsers, except Internet Explorer and Safari.
The disabled attribute is a boolean attribute.
When present, it specifies that a group of related form elements (a fieldset) should be disabled.
A disabled fieldset is unusable and un-clickable.
The disabled attribute can be set to keep a user from using the fields until some other condition has been met (like selecting a checkbox, etc.). Then, a JavaScript could remove the disabled value, and make the fieldset usable.
The disabled attribute is new for the <fieldset> tag in HTML5.
In XHTML, attribute minimization is forbidden, and the disabled attribute must be defined as <fieldset disabled="disabled">.
HTML <fieldset> tag
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