So - I've got input boxes that I make readonly like this

<input readonly type="text" class="awc-Refunds acs-edit-medium-text"/>

Been using these for a few months with no issues.

I just noticed that it's telling me in the IDE:

Validation (XHTML 1.0 Transitional): This attribute name must be followed by an equal (=) sign and a value. If the value is in quotation marks, the quotation marks must match.
Looking around the web I see that XHTML requires this to be

<input readonly="readonly" type="text" class="awc-Refunds acs-edit-medium-text"/>

Any problems with me changing this to the proper XHTML format.

I looked into the difference between HTML and XHTML - seems it's just evolving standards.

Is that all there is to it? Am I going to get burned by changing this??