This question is a bit off-topic, but I rather ask it here than any other site because I know there are some very good developers on here and I'd appreciate their answers more.
I've recently started re-skinning HTML pages, as in, moving the content of a page into a different page layout. Basically changing the footers and headers and leaving the content the same. I had an issue of coming across a badly coded page, which I fixed and submitted to the customer. The problem is, the customer doesn't want those errors fixed because it affects the CSS a bit, a CSS bug which I tried