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    • Data Validation for HTML

    Validate most user data from your HTML forms.

    Validation Attributes

    Add validation attributes to your form elements to validate user data without Javascript. There are several different attributes you can use:
    Attribute Description
    required Specifies whether a form field is required for submission. Add required to your input field. 
    • minlength
    • maxlength
    		 Set the minimum and maximum length for text input
    • min
    • max
    		 Set the minimum and maximum values for numerical input
    type Specify the data type:
    • Number
    • Email address
    • Other predefined type, like a button, a checkbox, or a text field
    For a full list of types, see The Input Form Element
    pattern Specifies a regular expression that defines the pattern for the form field data
    For in-depth information on built-in form validation, see Client-side Form Validation.

    Error Messages

    If you'd like to show a more specific error message when the user enters an invalid value or fails to enter a required field, you can add a title attribute and/or the pattern to match in with the required attribute.  
    <input type="text" name="vars[first_name]" required title="Enter your first name" />
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