Custom attributes - Yea or nay?

Question

Recently I have been reading more and more about people using custom attributes in their HTML tags, mainly for the purpose of embedding some extra bits of data for use in ja

Answer 1

Spec: Create an ASP.NET TextBox control which dynamically auto-formats its text as a number, according to properties "DecimalSeparator" and "ThousandsSeparator", using JavaScript.


One way to transfer these properties from the control to JavaScript is to have the control render out custom properties:

Custom properties are easily accessible by JavaScript. And whilst a page using elements with custom properties won't validate, the rendering of that page won't be affected.


I only use this approach when I want to associate simple types like strings and integers to HTML elements for use with JavaScript. If I want to make HTML elements easier to identify, I'll make use of the class and id properties.