. Do you understand what semantic markup is and do you follow it in your code?

Using semantic markup means that the (X)HTML code you use like tags and identifiers which describes the content and elements used should have a logical relationship to the data contained within them. Ex:

should be used for textual paragraphs,

should be used for unordered lists, etc. and applying IDs such as #Navigation, #Header and #Content to your

tags etc..