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Introduction to
Browser Internals
Sivasubramaniam Arunachalam
Sep 14, 2013
@sivaa_in
http://barcampbangalore.org/bcb/bcb14/introduction-to-browser-internals
It’s me!
Introduction to Browser Internals
It’s about you!
#barcampblr
#browser
Just Before We Get
Started
How many of you use
Internet Explorer
as your
Primary Browser?
http://www.w3schools.com/browsers/browsers_stats.asp
http://www.w3schools.com/browsers/browsers_stats.asp
Where do
you fit?
The rise (Chrome) and fall(IE)
http://upload.wikimedia.org/wikipedia/commons/thumb/8/86/Usage_share_of_web_browsers_%28Source_StatCounter%29.svg/600px-Usage_share_of_web_browsers_%28Source_StatCounter%29.svg.png
The Past
Now
Introduction to Browser Internals
Chrome
Chrome
What’s wrong?
Chrome
It’s Chrome. Not Google Chrome
Content
Dream to build an Operating System?
Build a Browser First
Computer Users Spent more time on?
1 Billion Mobile Devices Alone
(Android + iOS)
Hello Web Developers!
Know your platform
Black Box
White BoxOpen
Parts of a Web Page
Just Contents. Nothing Else
• Text
• Links
• Images
Video
Classical Web
Web Server Web Browser
HTML + CSS
Web Browser
Engine
<h1> BarCamp </h1> h1 { color:rgb(255,0,0); }
BarCamp
What Layout Engine will do?
• Parsing
• DOM Construction
• Resource Dispatching & Loading
• Event Handling
• Painting
• JS Bindings
Introduction to Browser Internals
Introduction to Browser Internals
Introduction to Browser Internals
Introduction to Browser Internals
Introduction to Browser Internals
The Internals
• All are Objects
• Document Object Model
<html> Root Document
• <head>
• <title>
• <body>
• <h1>
Access & Manipulation
• Web 1.0 (~ 0% Dynamic)
• Web 2.0
 Objects are Waiting
• DOM
 Need a Language
• Java Script
Introduction to Browser Internals
The Big Picture
Introduction to Browser Internals
OO DOM
• Members / Properties
• Methods / Behaviors
• Other Objects (recursive)
• DOT Notation
Examples:
• document.title
• Window.print()
Internal Objects of DOM
• window
• document
• navigator
• screen
• history
• location
DOM - Hierarchy
Node
 Element
HTML Element
HTML Input Element
HTML Table Element
DOM - Versions
 Legacy
 Intermediate
 Standard (W3C)
 DOM 1
 DOM 2 (getElementById)
 DOM 3 (Xpath)
 DOM 4
DOM Objects
Lets Explore it in Chrome
Lets do a magic!
Introduction to Browser Internals
How many changes?
Introduction to Browser Internals
// Create and add Reset Box
var reset_box = document.createElement(‘input’)
reset_box.type = 'reset'
document.forms[0].appendChild(reset_box)
// Change the button Label
document.getElementById("gbqfsa").innerHTML = "SAP Search"
// Change the Font Size of footer
document.getElementById("flls").style.fontSize = '2em'
// Change the branding image
document.images[1].src = "http://upload.wikimedia.org/wikipedia/en/e/e4/Logo_SAP.gif"
Lets browse
www.google.com
(other than Google Chrome)
Introduction to Browser Internals
Introduction to Browser Internals
How is it possible?
Introduction to Browser Internals
No No! Rajinikanth is not working for Chrome.
No Magic at All
Its all about awesome engineering
(Lets revisit the basics)
A Brand New Request
 Parse the URL
 Domain
 Protocol
 DNS Resolve
 TCP Connection
 HTTP Request
The Response
HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
XML Mode
Introduction to Browser Internals
HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
Content-Type: text/html
HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
Content-Type: text/html
<html>
HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
Content-Type: text/html
<html>
Quirks Mode
http://upload.wikimedia.org/wikipedia/commons/thumb/6/64/W3C_and_Internet_Explorer_box_models.svg/300px-W3C_and_Internet_Explorer_box_models.svg.png
HTTP/1.1 200 OK
Content-Type: application/xhtml+xml
Content-Type: text/html
<!doctype html>
<html>
Standard Mode
Sample HTML
DOM Tree
•Image
•CSS
•JavaScript
Sub Resources
• Non-Blocking
• Image Decoder
• Paint
Image
• Non-Blocking
• Bucket Identification
• Style Matching
• Element to CSS Selector
• Not like JS
CSS
• ~ Blocking
• <script>
• document.write()
JavaScript – Classical Browsers
• Non Blocking
• No DOM Tree
• Parsing the HTML
JavaScript – Modern Browsers
<script>
defer & async
http://stackoverflow.com/questions/10808109/script-tag-async-defer
JavaScript
JavaScript & DOM
=
Programming Language + DB
Introduction to Browser Internals
Introduction to Browser Internals
• View Port
• Block
• Scroll
• Block
• Text
Frame Construction
Introduction to Browser Internals
• Positions
• Dimensions
• Related Attributes
• Margin
• Padding
Layout Construction
http://www.youtube.com/watch?v=dndeRnzkJDU
Introduction to Browser Internals
Introduction to Browser Internals
• Mostly done by CPU
• Now, delegates to GPU
Painting
A Scrollable Page
with Fixed
Background Image
Lets Talk about the
RajiniKanth Factor
Chrome’s Network Stack
Average Web Page Size?
# of Sub Resources?
DNS Resolve
DNS Pre Resolve
How about Wikipedia?
TCP Connect
TCP Pre Connect
http://www.igvita.com/2012/06/04/chrome-networking-dns-prefetch-and-tcp-preconnect/
Pooling & Reuse, Caching
Chrome Internals
chrome://dns
chrome://omnibox/
chrome://net-internals/
chrome://predictors
chrome://histograms/DNS.PrefetchResolution
chrome://cache
Where to Start?
http://www.macdevcenter.com/lpt/a/4570
WebKit? Chrome?
(5GB)
libwww
BYOB
(Build Your Own Browser)
http://www.macdevcenter.com/lpt/a/4570
Thank You!
siva@sivaa.in
bit.ly/sivasubramaniambit.ly/sivaa_in
References
http://www.clker.com/cliparts/6/7/0/f/o/X/birthday-cake-four-candles-md.png
http://leashsstuff.blogspot.in/2011/06/browser-cartoon.html
https://blog.mozilla.org/webdev/2012/05/04/how-browser-engines-work/

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