Can we add new attribute in html controls (not in html 5 using data keyword)

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I have a idea of creating java script validation framework using class or using custom html attrbutes.

Eg:

HTML

<input type='text' name='txtUserName' class='txtBoxNormal req alphaOnly minLen:5 maxlen:12'>

txtBoxNormal => for applying css style
req => to speacify required field
alphaOnly => to specify alphabetic only allowed
minLen:5 & maxlen:12 => to restrict length of text allowed

Or shall i use below idea:

Eg:

HTML

<input type='text' name='txtUserName' required='true' type='alphOnly' minlen='5' maxlen='12'>

Can i know which will be flexible and efficient idea? pls guide me

[Edit]Code block added[/Edit]

Posted 22-Oct-12 7:20am

HarisJayadev

Updated 22-Oct-12 7:23am

Thomas Daniels

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-10-22T07:35:00

In principle, you can retrieve a value of any attribute using getAttribute function:
http://www.w3schools.com/jsref/met_element_getattribute.asp[^].

I would say this practice is questionable. I would not recommend it. Even though it should practically work, such HTML usage cannot be standard. If you process HTML as XHTML (which is very reasonable, because it helps to eliminate non-well-formed constructs and perform tighter testing in general), your HTML will fail. This is explainable. What if the future HTML standard introduces some new attributes with the same name as yours? Where will you be in this case?

—SA