Require autocomplete attribute to be valid

Rule ID:

valid-autocomplete

Category:

HTML syntax and concepts

Standards:

• HTML5

The HTML5 autocomplete attribute can be used in different ways:

• On a <form> element it can take the on or off values to set the default for all nested controls.
• On form controls it can either take on or off to enable and disable or it can take a number of space-separated tokens describing what type of autocompletion to use.
• With the exception that <input type="hidden"> cannot use on or off.

Further the space-separated tokens must appear in the following order:

• An optional section name (section- prefix).
• An optional shipping or billing token.
• An optional home, work, mobile, fax or pager token (for field names supporting it).
• A required field name.
• An optional webauthn token.

Typical field names would be:

• name
• username
• current-password
• address-line1
• country-name
• etc

For a full list of valid field names refer to the HTML5 standard Autofill section.

Some field names can only be used on specific input controls, for instance:

• A new-password field cannot be used on <input type="number">
• A cc-exp-month field cannot be used on <input type="date">
• etc

Again, refer to the Autofill section in the standard for a full table of allowed controls.

Rule details

Examples of incorrect code for this rule:

<input type="text" autocomplete="foo">
<input type="text" autocomplete="name billing">
<input type="text" autocomplete="street-address">

error: "foo" is not a valid autocomplete token or field name (valid-autocomplete) at inline:1:34:
> 1 | <input type="text" autocomplete="foo">
    |                                  ^^^
  2 | <input type="text" autocomplete="name billing">
  3 | <input type="text" autocomplete="street-address">


error: "billing" must appear before "name" (valid-autocomplete) at inline:2:39:
  1 | <input type="text" autocomplete="foo">
> 2 | <input type="text" autocomplete="name billing">
    |                                       ^^^^^^^
  3 | <input type="text" autocomplete="street-address">


error: "street-address" cannot be used on <input type="text"> (valid-autocomplete) at inline:3:34:
  1 | <input type="text" autocomplete="foo">
  2 | <input type="text" autocomplete="name billing">
> 3 | <input type="text" autocomplete="street-address">
    |                                  ^^^^^^^^^^^^^^


3 errors found.

Examples of correct code for this rule:

<input type="text" autocomplete="name">
<input type="text" autocomplete="billing name">
<textarea autocomplete="street-address"></textarea>

References

• HTML5 section 4.10.18.7: Autofill

Version history

• 8.15.0 - Rule added.