Verify whether a string is a valid HTML tag name

Question

How can I find out if a string is a valid HTML tag?

For example: a, or h1, div, or span, ... are a valid HTML tagname. But ar, or abc, or div2, ... are invaild.

Answer 1

Get a list of valid HTML tags (or whatever you want to compare with) and simply do something like:

function IsValid(s) {
    var tags = ['a', 'p', 'etc...'];
    return tags.indexOf(s) != -1;
}