In CSS, IDs (denoted by the hash) are always unique elements on the page, so whether or not the browser reads left-to-right or right-to-left, the selectors #menu ul li a are redundant anyway.

Tony Patton focuses on CSS fundamentals and explains how multiple rules for the same element are handled. Multiple rules ensure that there will be no surprises for either you or the user community.

The :has pseudo-class. The :has pseudo-class is an interesting addition to the selector aspect of CSS. As of this writing, all the major browsers except Firefox support it, with Firefox allowing ...