HTML Checking for Large Sites
Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as text.
The maxlength
attribute can be used on an input
element to define a client-side validation for the maximum length allowed on an input without resorting to JavaScript.
This attribute is only allowed on elements of type email
, password
, search
, tel
, text
, or url
.
The minlength
attribute can be used on an input
element to define a client-side validation for the maximum length allowed on an input without resorting to JavaScript.
This attribute is only allowed on elements of type email
, password
, search
, tel
, text
, or url
.
The minlength attribute defines the minimum number of characters (as UTF-16 code units) the user can enter into an <input>
or <textarea>
. This must be an integer value 0 or higher. If no minlength is specified, or an invalid value is specified, the input has no minimum length. This value must be less than or equal to the value of maxlength, otherwise the value will never be valid, as it is impossible to meet both criteria.
Here’s an example:
<label for="name">Enter your name (max 25 characters)</label>
<input type="text" minlength="25" id="name">
Learn more:
The pattern
attribute is only allowed on input whose type
is email
, password
, search
, tel
, text
or url
. Check the type
used, and consider changing to one of the allowed types to enable pattern client-side validation.
The pattern
attribute is a handy way of adding client-side validation on HTML forms without resorting to JavaScript. Check out this article to learn more about Input Pattern.
The boolean required
attribute can only be used with certain types of inputs. Check the input type is one of the allowed.
The required
attribute, if present, indicates that the user must specify a value for the input before the owning form can be submitted.
Learn more:
The value tel-national
cannot be used on the attribute autocomplete
of an <input>
element of type tel
. Either change to type="text"
, or use autocomplete="tel"
. Examples:
<!-- Using autocomplete "tel-national" on type "tel" is invalid -->
<input name="phone1" type="tel" autocomplete="tel-national" />
<!--Using autocomplete "tel-national" on type "text" is valid -->
<input name="phone2" type="text" autocomplete="tel-national" />
<!--Using autocomplete "tel" on type "tel" is valid -->
<input name="phone3" type="tel" autocomplete="tel" />
Read more about the autocomplete attribute.
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