![]() ![]() For example, required="required" is not a valid value in HTML but as required is boolean, invalid values resolve to true. If the attribute is true, include the attribute but don't provide a value. If the attribute value is false, omit the attribute. All values, including true, false, and □, while invalid, will resolve to true. If not present, it isn't.īoolean values can either be omitted, set to an empty string, or be the name of the attribute but the value doesn't have to actually be set to the string true. If one (or more) of these attributes is present, the element is disabled, required, readonly, etc. Boolean attributes include autofocus, inert, checked, disabled, required, reversed, allowfullscreen, default, loop, autoplay, controls, muted, readonly, multiple, and selected. If a boolean attribute is present, it is always true. ![]() If an attribute value is case-sensitive in HTML, it is case-sensitive when used as part of an attribute selector in CSS and in JavaScript otherwise, it's not. Strings values that are defined, such as class and id names, are case-sensitive. Values that are part of the HTML specification are case-insensitive. ![]() While HTML is not case-sensitive, some attribute values are. For this reason, and for improved legibility, quoting is always recommended. If an attribute value includes a space or special characters, the value must be quoted. In HTML, all attributes except boolean, and to some extent enumerated attributes, require a value. Other attributes apply to several elements but not all, while other attributes are element-specific, relevant only to a single element. Some attributes are global, meaning they can appear within any element's opening tag. Attributes are space-separated names and name/value pairs appearing in the opening tag, providing information about and functionality for the element.Īttributes define the behavior, linkages, and functionality of elements. Attributes were briefly discussed in Overview of HTML it's time for a deep dive.Īttributes are what make HTML so powerful. ![]()
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