Update existing design of a website, use of CSS -

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i'd opinions if plan worthwhile or not. have existing site, , elements have css class defined. thought append each element has class new class:

<div class="existingclass">

would turn into:

<div class="existingclass newclass">

then, if want override attributes in "existingclass", in "newclass" (because last class attributes taken?). figure way, nothing break, not risk because not removing "existingclass".

any problems plan?

first know in existingclass. write newclass in such manner won't break layout. knowing in existingclass use tools firebug save time.


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