Using HTML5 sensibly

Using HTML5 sensiblyChristian Heilmann, London Ajax User Meetup, February 2011

This will be a change frommy normal talks.Instead of giving you thefacts, it is my turn to asksome questions.

But first, let me tell you astory. As stories areimportant!

Back in 1939......Antarctica needed exploring

The Antarctic Explorer

So let’s see what wentwrong there...★ Purely engineering driven★ Tested while on the road★ Never tested in the real environment★ Massive media excitement before it proved its worth

HTML5 is the new hotness!

http://studio.html5rocks.com/

http://www.apple.com/html5/

http://html5advent.com/

Everything is HTML5 -including browser specifictricks.

To a degree this isunderstandable.There is a lot of confusionabout the players and thespecs.

HTML(5)Markup general WTFJavaScript APIsStuff for Browser/Parser developers

This gives people lots ofspace for interpretationand focus - and theopportunity to rant.

The main premise ofHTML5 is pragmatism -making things simpler forall of us.

Another big topic is thatXML was just not for theweb - end users should notsuffer for the errors of theauthors.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd"><html lang="en"><head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>HTML - cest moi!</title> <link rel="stylesheet" type="text/css" href="styles.css"> <script type="text/javascript" src="magic.js"> </script></head><body> <h1>Heading! Everybody duck!</h1> <p>I am content, hear me roar!</p> <p class="footer">By me!</p></body></html>

<!DOCTYPE html><html lang="en"><head> <meta charset="utf-8"> <title>HTML5, cest moi, ou HTML...</title> <link rel="stylesheet" href="styles.css"> <script src="magic.js"></script></head><body> <h1>Heading! Everybody duck!</h1> <p>I am content, hear me roar!</p> <p class="footer">By me!</p></body></html>

HTML5 also includes newsemantic elements (basedon class names in use) thatstructure our documentsmuch better than before.

<!DOCTYPE html><html lang="en"><head> <title>HTML5, cest moi, ou HTML...</title> <link rel="stylesheet" href="styles.css"> <script src="magic.js"></script></head><body> <header>Heading! Everybody duck!</header> <section> <p>I am content, hear me roar!</p> </section> <footer><p>By me!</p></footer></body></html>

HTML5 definesand expectsbrowsers to fixomissions forus - anddoesn’t mindcase or quotes.

<!DOCTYPE html><html lang=en> <TITLE>HTML5, cest moi, ou HTML...</title> <LINK rel=stylesheet href=styles.css> <script src=magic.js></SCRIPT><body> <HEADER>Heading! Everybody duck!</header> <section> <p>I am content, hear me roar!</p> </SECTION> <footer><p>By me!</p></FOOTER></body></HTML>

The reason is that browsersdo that anyways - justcheck the generated codeof a document like that.

<!DOCTYPE html><html lang="en"><head> <title>HTML5, cest moi, ou HTML...</title> <link rel="stylesheet" href="styles.css"> <script src="magic.js"></script> </head><body> <header>Heading! Everybody duck!</header> <section> <p>I am content, hear me roar!</p> </section> <footer><p>By me!</p></footer></body></html>

<!DOCTYPE html><html lang=en> <TITLE>HTML5, cest moi, ou HTML...</title> <LINK rel=stylesheet href=styles.css> <script src=magic.js></SCRIPT><body> <HEADER>Heading! Everybody duck!</header> <section> <p>I am content, hear me roar!</p> </SECTION> <footer><p>By me!</p></FOOTER></body></HTML>

<!DOCTYPE html><html lang="en"><head> <title>HTML5, cest moi, ou HTML...</title> <link rel="stylesheet" href="styles.css"> <script src="magic.js"></script></head><body> <header>Heading! Everybody duck!</header> <section> <p>I am content, hear me roar! <footer></footer> </p> <p>By me!</p> </section></body></html>

Browsers fix a lot of stufffor us, this has always beenthe case.

?Can innovation be based on“people never did thiscorrectly anyways”?

?Is it HTML or BML?

?Should HTML be there onlyfor browsers?What about conversionServices? Search bots?Content scrapers?

Internet Explorer 6

Internet Explorer doesn’tallow styling for elements itdoesn’t understand as partof HTML.

HTML is the thing we baseeverything on - so if weexclusively use the newHTML5 elements, we giveIE unstyled documents.

Time to applysome fixes!

First fix - elements createdwith JS can be styled in IE.<!DOCTYPE html><html lang="en"><head> <meta charset="utf-8"> <style>header{color:#fff;background:#369;}</style> <script>document.createElement(header);</script></head><body> <header>Hello!</header></body></html>

Remy Sharp packaged thatup nicely in HTML5shiv. http://code.google.com/p/html5shiv/

Cue the purists of the web.“HTML should work withoutJavaScript!”

Next solution:Sending HTML5 as XML orgiving it a namespace.http://www.ibm.com/developerworks/xml/library/x-think45/http://www.debeterevormgever.nl/html5-ie-without-javascript/

Purist solution:add DIVs around the newelements..header,header,.footer,footer,.aside,aside,.section,section{ display:block;}

<!DOCTYPE html><html lang="en"> <head><meta charset="utf-8"> <title>HTML5, cest moi, ou HTML...</title> <link rel="stylesheet" href="styles.css"> <script src="magic.js"></script> </head> <body> <div class="header"><header> Heading! Everybody duck! </header></div> <div class="section"><section> <p>I am content, hear me roar!</p> </section></div> <div class="footer"><footer> <p>By me, bitches!</p> </footer></div></body></html>

Bloody Internet Explorer!We always have to dothings extra for it!

All browsers fail in one wayor another and needpatches. Our job is to knowthem.Luckily, there is help.

http://www.modernizr.com/

http://html5boilerplate.com/

And as if by magic - themuch shorter andpragmatic markup becamemore complex again.

<!doctype html> <html lang="en"class="no-js"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible"content="IE=edge,chrome=1"> <title></title> <meta name="viewport" content="width=device-width,initial-scale=1.0">

One solution to use HTML5APIs with legacy browsersis using polyfills.

https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills

?Should we shoe-horn newtechnology into legacybrowsers?

?Do patches add complexityas we need to test theirperformance?

?How about moving IE<9fixes to the server side?Padding with DIVs withclasses and no JS for IE?

Making video and audiosimpler.

Embedding audio and videois easy in HTML5<video src="interview.ogv" controls> <a href="interview.ogv">Download the video</a></video>

To make all capablebrowsers play the video...<video controls> <source src="interview.mp4" type="video/mp4"> </source> <source src="interview.webm" type="video/webm"> </source> <source src="interview.ogv" type="video/ogg"> </source> <p>Download the <a href="interview.mp4">video in MP4 format</a>. </p></video>

Where there is a need,there is an opportunity for abusiness.

However, there is a realproblem for businesses.

http://www.webkitchen.be/2011/01/26/stealing-content-was-never-easier-than-with-html5/

?Can we expect contentcreators to create video inmany formats to supportan open technology?

?Can a service like vid.ly betrusted for content creationand storage?

?Is HTML5 not applicable forpremium content?

It is time for all of us totake initiative and makethis work.

Question authority and callout wrong messaging.

Bad use of technologydoesn’t only break end userexperiences - it breaks theweb!http://gawker.com/#!5754678/what-should-our-new-national-anthem-be

http://www.whatwg.org/mailing-list

https://developer.mozilla.org/

Thanks!Chris Heilmann@codepo8http://icant.co.uk

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Using HTML5 sensibly

by Christian Heilmann on Feb 08, 2011

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