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This article introduces the relevant knowledge of "what is the definition of valid, invalid and required in html5". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

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IE9+

Definition of valid, invalid, required

The code is as follows

Copy the code

The code is as follows:

Input:required, input:valid, input:invalid {border:0 none; outline: 0 none;-webkit-box-shadow:none;-moz-box-shadow:none;-ms-box-shadow:none;-o Mustang shadowlone; box-shadow:none;}

In the past, verification forms used to use js and rules to determine whether the content filled in was correct, such as email verification.

The emergence of HTML5 provides us with some properties that can solve the content of the validation form without writing js and rules.

: required

Must, then input can't be empty.

: valid

Valid, that is, triggered when the filled content meets the requirements.

: invalid

Invalid, that is, triggered when the filled content does not meet the requirements.

This is the end of the introduction of "what are the definitions of valid, invalid and required in html5". Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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