CSS 2.1 errors: not a known property name

Question

Here is my code, I got it from an AJAX sample:

body, div, p, h1, h2, h3, h4, ul, li, table
{
    margin:0;
    padding:0;
    border:none;
}

body
{
    backgrou         


        

Answer 1

You need to validate this as CSS3

http://jigsaw.w3.org/css-validator/#validate_by_input+with_options

When you do that, you will two errors for your opacity styles and a bunch of warnings dealing with duplicated background-colors.