Ahmed Mahmoud ahmedam55

DOM Performance

How the browser renders the document
- Receives the data (bytes) from the server.
- Parses and converts into tokens (<, TagName, Attribute, AttributeValue, >).
- Turns tokens into nodes.
- Turns nodes into the DOM tree.
Builds CSSOM tree from the css rules.

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

1 - Make sure you have Counter Strike installed

2 - Download YAPB http://forums.bots-united.com/showthread.php?t=9986

3 - Extract the zip and move the folder addons with all the content to ~/Library/Application Support/Steam/steamapps/common/Half-Life/cstrike

4 - After that, open the file liblist.gam in the folder above and replace gamedll_osx "dlls/cs.dylib" with this content:

//gamedll_osx "dlls/cs.dylib"

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.~~

	self.addEventListener('install', function (event) {
	event.waitUntil(preLoad());
	});

	var preLoad = function () {
	// console.log('[PWA Builder] Install Event processing');
	return caches.open('pwabuilder-offline').then(function (cache) {
	// console.log('[PWA Builder] Cached index and offline page during Install');
	return cache.addAll(['/offline.html', '/']);
	});

	/*
	Incredibly simple Node.js and Express application server for serving static assets.

	DON'T USE THIS IN PRODUCTION!
	It is meant for learning purposes only. This server is not optimized for performance,
	and is missing key features such as error pages, compression, and caching.

	For production, I recommend using an application framework that supports server-side rendering,
	such as Next.js. https://nextjs.org

	axios({
	url: 'http://localhost:5000/static/example.pdf',
	method: 'GET',
	responseType: 'blob', // important
	}).then((response) => {
	const url = window.URL.createObjectURL(new Blob([response.data]));
	const link = document.createElement('a');
	link.href = url;
	link.setAttribute('download', 'file.pdf');
	document.body.appendChild(link);

	// Add a 401 response interceptor
	window.axios.interceptors.response.use(function (response) {
	return response;
	}, function (error) {
	if (401 === error.response.status) {
	swal({
	title: "Session Expired",
	text: "Your session has expired. Would you like to be redirected to the login page?",
	type: "warning",
	showCancelButton: true,

	$layout-direction: ltr !default;

	@mixin ltr {
	@if $layout-direction == ltr {
	@content;
	}
	}
	@mixin rtl {
	@if $layout-direction == rtl {
	@content;

	<p th:text="${bean.field + '!' + bean.field}">Static content</p>

	th:text="'static part' + ${bean.field}"

	th:text="${'static part' + bean.field}"