indicates the minimum and maximum number of characters.
This will allow domain names with 2, 3 and 4 characters e.g.; us, tx, org, com, net, wxyz).
Note that ARIA is an independent specification that's not specifically related to HTML5.
The easiest and safest way to check whether an email address is well-formed is to use PHP's filter_var() function.
For legacy browsers, it's possible to use a polyfill such as Hyperform to compensate for the lack of support for the constraint validation API.Currently, Sam is the Founder of Crypto News, Australia.Form validation helps us to ensure that users fill out forms in the correct format, making sure that submitted data will work successfully with our applications.Email format: The regular expression for email is : Finally, the email address must end with two to four alphabets.Having a-z and A-Z means that both lowercase and uppercase letters are allowed.