Question

My question is simple

How many custom attributes we can use in a element e.g

<input value="1" vcFlag="true" name="example" />

I am using vcFlag=”true” as custom attribute how many attributes like this I can put in this input element. Is there any limit or not.

thanks

Answer 1

There is no (theoric) limit to the number of attributes you can add to a HTML tag:

Every HTML element may have any number of custom data attributes specified, with any value.

Attribute parsing is slower than node parsing so if you use a huge number of custom attributes you may slow down page parsing, specially on some old browsers.

Just rmember to prefix them with data- to be HTML 5 compatible: Data Attributes on W3C Working Draft.

In your case it should be:

<input value="1" data-vcFlag="true" name="example" />