Ask HN: What's your most useful CSS or JavaScript trick?

6 points by smashing_mag ↗ HN
Over time we all learn little nifty coding tricks that help us solve common problems or anticipate potential bugs. What's your favorite CSS or JavaScript tip for beginners and professionals? What do you keep using often in your design or development work?

6 comments

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CSS Reset. Every project starts with a full reset.
Full Reset? As in * { clear everything }?
Look up the Eric Meyer CSS reset. It saves tons of time with cross-browser compatibility issues straight from the beginning.
*rule/_rule for CSS ie6/7 hacks font-weight: 900 instead of bold, saves 1 character :P
Simple doctype: <!DOCTYPE html>

Script tags just work (no need for type="text/javascript": <script></script>

CSS

Understand how to do general vs specific border/margin/etc assignments and how they cascade. Useful for generic

classes:

.class1{ border:1px solid #000; }

.sub_class1{ border-bottom:2px solid #cc0000; }

JS

0|3.14 === 3, vs Math.floor(3.14) === 3