Not to mention that Netscape 4 never really implemented CSS. There was a CSS-to-JSS (JavaScript Style Sheets) translation level that almost worked most of the time, but it couldn't manage markup that resulted in a deeply-nested native object hierarchy (something that was altogether too easy to do in straightforward HTML). Nor did DIV or IFRAME properly translate to LAYER and ILAYER. Element addressing in NS was pretty much strictly hierarchical; one needed to include a tree search for NS to get something similar to getElementByXXX(). (And I had to support that horrid thing until 2005.)