Ryan Smith eikeco

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

Essential JavaScript Links

I no longer mantain this list. There are lots of other very comprehensive JavaScript link lists out there. Please see those, instead (Google "awesome JavaScript" for a start).

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:

	/------------------------------------\
	#PRIMARY-MENU
	\------------------------------------/
	.primary-menu {
	@include grid;
	@include sans-serif;
	font-weight: $bold;
	height: $nav-bar-height;

	&__wrapper {

	<?php
	/**
	* Get the Yoast primary category from its post meta value, and displays it, with HTML markup.
	* If there is no primary category set, it displays the first assigned category.
	*
	* @param boolean $useCatLink Whether to link the category, if it exists
	* @return void
	*/
	function yourtheme_display_yoast_primary_category( $useCatLink = true ) {

	<?php
	/*
	Plugin Name: My Groups Widget
	Description: This BuddyPress widget lists the groups of which the logged in user is a member.
	Version: 1.0
	Revision Date: March 10, 2015
	Requires at least: WP 4.0, BuddyPress 2.0
	Tested up to: WP 4.1.1, BuddyPress 2.2.1
	License: Example: GNU General Public License 2.0 (GPL) http://www.gnu.org/licenses/gpl.html
	Author: Dan

	<form class='form-inline' id='my-custom-form'>
	<div class="form-group">
	<input type='email' class='form-control' placeholder='Your email address' required>
	</div>
	<button class="btn btn-primary" type='submit'>Sign up</button>
	</form>

	<!-- Actual form that gets submitted to HubSpot -->
	<div class="hidden" id='hubspot-form'>
	<script charset="utf-8" src="//js.hsforms.net/forms/current.js"></script>

	/*

	Author: Josh McDonald
	Twitter: @onestepcreative
	Website: joshmcdonald.net


	A simple helper to log color coded messages to the
	javascript console, using a shorter syntax to console.log
	You can leave your dev.log() statements scattered throughout

	$("a[rel=external], a[href^='http:']:not([href='" + window.location.host + "']), a[href^='https:']:not([href='" + window.location.host + "'])").each(function(){
	$(this).attr("target", "_blank");
	});

	@mixin vendor($property, $value...){
	-webkit-#{$property}:$value;
	-moz-#{$property}:$value;
	-ms-#{$property}:$value;
	-o-#{$property}:$value;
	#{$property}:$value;
	}