Mike Joyce mikejoyceio

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

MySQL

Getting started

Advanced SCSS

Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.

I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.

This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	function walk(node) {
	// I stole this function from here:
	// http://is.gd/mwZp7E

	var child, next;

	var tagName = node.tagName ? node.tagName.toLowerCase() : "";
	if (tagName == 'input' \|\| tagName == 'textarea') {
	return;
	}

	<?php /*
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	<!DOCTYPE html>

	<html>
	<head>
	<title>MemeMaker-Simple</title>

	<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
	<meta name="mobile-web-app-capable" content="yes">
	<meta name="apple-mobile-web-app-capable" content="yes">
	<style>

	/**
	* Get a random floating point number between `min` and `max`.
	*
	* @param {number} min - min number
	* @param {number} max - max number
	* @return {number} a random floating point number
	*/
	function getRandomFloat(min, max) {
	return Math.random() * (max - min) + min;
	}

	/* Sample JavaScript file added with ScriptTag resource.
	This sample file is meant to teach best practices.
	Your app will load jQuery if it's not defined.
	Your app will load jQuery if jQuery is defined but is too old, e.g. < 1.7.
	Your app does not change the definition of $ or jQuery outside the app.
	Example: if a Shopify theme uses jQuery 1.4.2, both of these statements run in the console will still return '1.4.2'
	once the app is installed, even if the app uses jQuery 1.9.1:
	jQuery.fn.jquery => "1.4.2"
	$.fn.jquery -> "1.4.2"
	*/