What do square brackets in class names mean?

user_247243 0
Viewed 52345

I saw here square brackets that are used in class names:

<input class="validate[required,custom[onlyLetter],length[0,100]]" name="firstname" type="text" />

What do these square brackets mean?

html
7 Answers

Example:

[what-ever] {
    color: red;
}
<p what-ever>Hello</p>

This will color Hello red. You can use square-bracket as class names

user_149667150
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