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Showing content from https://webplatform.github.io/docs/html/attributes/required below:

required · WebPlatform Docs

The required attribute is a boolean attribute. When present, it specifies that an input field must be filled out before submitting the form.

## Examples

A required input field

Username: <input type="text" name="username" required>

The attribute can be set on text, text area, URL, email, select, checkbox, or radio button elements. It is a Boolean attribute and needs to be specified only on an element. When users hover the mouse over a required field, they’ll see a tool tip stating that it is a required field. The following example shows the validation attribute on a text input field.

HTML5

W3C Recommendation

• HTMLInputElementHTMLInputElement
• HTMLSelectElementHTMLSelectElement
• HTMLTextAreaElementHTMLTextAreaElement

• Microsoft Developer Network: [Windows Internet Explorer API reference Article]

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