Yinka Adedire yinkakun

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

~~Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.~~

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

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

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

	0-mail.com
	007addict.com
	020.co.uk
	027168.com
	0815.ru
	0815.su
	0clickemail.com
	0sg.net
	0wnd.net
	0wnd.org

	@font-face {
	font-family: GT Walsheim Pro;
	src: local("GT Walsheim Pro Regular"),local("GTWalsheimProRegular"),url(GTWalsheimProRegular.woff2) format("woff2"),url(GTWalsheimProRegular.woff) format("woff"),url(GTWalsheimProRegular.ttf) format("truetype");
	font-weight: 400;
	font-style: normal
	}

	@font-face {
	font-family: GT Walsheim Pro;
	src: local("GT Walsheim Pro Bold"),local("GTWalsheimProBold"),url(GTWalsheimProBold.woff2) format("woff2"),url(GTWalsheimProBold.woff) format("woff"),url(GTWalsheimProBold.ttf) format("truetype");

	# overwrite master with contents of feature branch (feature > master)
	git checkout feature # source name
	git merge -s ours master # target name
	git checkout master # target name
	git merge feature # source name

	==========================
	How Software Companies Die
	==========================
	- Orson Scott Card

	The environment that nurtures creative programmers kills management and
	marketing types - and vice versa.

	Programming is the Great Game. It consumes you, body and soul. When
	you're caught up in it, nothing else matters. When you emerge into


	/*
	##Device = Desktops
	##Screen = 1281px to higher resolution desktops
	*/

	@media (min-width: 1281px) {

	/* CSS */

	* {
	background: #000 !important;
	color: #0f0 !important;
	outline: solid #f00 1px !important;
	}