Quirks Mode and Strict Mode
Peter-Paul Kochs is a free-lance web developer and JavaScript guru in Amsterdam, the Netherlands. Quirksmode.org is his personal site, a free website that gives browser compatibility information and rather a lot of copy-pastable scripts.
I’ve always strongly believed in free information as a cornerstone of the Web. Anyone can view any bit of code by doing a simple View Source, so the information is already there. If I take about half an hour to not only post a script, but also explain why I wrote the script in this particular way, budding web developers will more quickly make the step from simple copy-pasting to copy-tweaking, and from there on to a real understanding of JavaScript and CSS.
Quirks mode and strict mode are the two ‘modes’ modern browsers can use to interpret your CSS. This page gives a short overview of the reasons for and the differences between these two modes.












