Keith Chu keithchu

Frontend Development

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I wanted to figure out the fastest way to load non-critical CSS so that the impact on initial page drawing is minimal.

TL;DR: Here's the solution I ended up with: https://github.com/filamentgroup/loadCSS/

For async JavaScript file requests, we have the async attribute to make this easy, but CSS file requests have no similar standard mechanism (at least, none that will still apply the CSS after loading - here are some async CSS loading conditions that do apply when CSS is inapplicable to media: https://gist.github.com/igrigorik/2935269#file-notes-md ).

Seems there are a couple ways to load and apply a CSS file in a non-blocking manner:

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

	/*!
	An experiment in getting accurate visible viewport dimensions across devices
	(c) 2012 Scott Jehl.
	MIT/GPLv2 Licence
	*/

	function viewportSize(){
	var test = document.createElement( "div" );

	test.style.cssText = "position: fixed;top: 0;left: 0;bottom: 0;right: 0;";

	#Model

	@user.should have(1).error_on(:username) # Checks whether there is an error in username
	@user.errors[:username].should include("can't be blank") # check for the error message

	#Rendering
	response.should render_template(:index)

	#Redirecting
	response.should redirect_to(movies_path)

	#!/usr/bin/env sh

	##
	# This is script with usefull tips taken from:
	# https://github.com/mathiasbynens/dotfiles/blob/master/.osx
	#
	# install it:
	# curl -sL https://raw.github.com/gist/2108403/hack.sh \| sh
	#

	Benchmark.bmbm do \|x\|
	x.report('<<:') do
	arr = []
	50_000.times do \|i\|
	arr2 = [i]
	arr << arr2
	end
	end

	x.report('+=:') do

	{
	"bold_folder_labels": true,
	"color_scheme": "Packages/User/Espresso Soda.tmTheme",
	"ensure_newline_at_eof_on_save": true,
	"file_exclude_patterns":
	[
	".DS_Store",
	".gitkeep",
	"dump.rdb"
	],

	gifify() {
	if [[ -n "$1" ]]; then
	if [[ $2 == '--good' ]]; then
	ffmpeg -i $1 -r 10 -vcodec png out-static-%05d.png
	time convert -verbose +dither -layers Optimize -resize 600x600\> out-static*.png GIF:- \| gifsicle --colors 128 --delay=5 --loop --optimize=3 --multifile - > $1.gif
	rm out-static*.png
	else
	ffmpeg -i $1 -s 600x400 -pix_fmt rgb24 -r 10 -f gif - \| gifsicle --optimize=3 --delay=3 > $1.gif
	fi
	else


	var common = [], uncommon = [], rare = [], veryRare = [], extremelyRare = [], itemGrid, items;

	itemGrid = $("div.collection ul.item-grid");
	items = itemGrid.children();

	items.each(function(i,e){
	var rarity;
	if($(this).find("span.title").children("a").attr("class")) {
	rarity = $(this).find("span.title").children("a").attr("class");