An attribute of an entity that must have a value for each entity instance is a required attribute.
A Boolean attribute is the required attribute. When present, it indicates that a field has to be completed before the form can be submitted. The following input kinds are supported by the needed attribute: text, search, URL, TEL, email, password, date pickers, number, checkbox, radio, and file.
HTML elements' colors, sizes, and other characteristics can be altered using HTML attributes. For instance, you can alter a text element's font color or size using an attribute, or an image element's width and height using an attribute.
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