The other day I was writing a function in JavaScript. Alright, before you say it – yes, it was broken in IE7/8. However, sometimes when you use common functions like trim and innerText you don’t really think about compatibility… especially if you’re an analyst. That’s what we call “knowing enough JavaScript to be dangerous.” Now normally I use jQuery and for all intents and purposes that’s fine. What if you need to use a JS object before jQuery loads, though? Let me make this simple. Use these 2 sites:
http://caniuse.com/ (HTML, CSS, JS)
http://www.quirksmode.org/dom/w3c_html.html (Messing with DOM elements)