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60 HTML5 NOw

inline SvG

HTML5 deﬁnes how to natively embed and parse

<svg>

elements and their

children. For example:

<p>

The following SVG should show a green circle:

<svg>

</svg>

</p>

However, as of this writing, no browser supports this.

Note that HTML5 has a provision for inline MathML that’s not supported by any

of today’s HTML5 browsers either. This provision will be very useful for scien-

tists and mathematicians when browsers do support it. However, just like inline

SVG, it’s not something we can use on the web today.

Maybe someday inline SVG will work. Until then, I recommend only using SVG

as Wikipedia does — for external decorative images that are better represented

by vector graphics than bitmapped images.

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11 HTML5 NaTivE vECTOr graPHiCs 61

canvaS

HTML5 introduces the new

element for

drawing arbitrary vector graphics using JavaScript

code in contrast to SVG’s approach of using XML

markup. Here’s a simple example.

<!DOCTYPE html><meta charset=”utf-8”>

<title>Canvas example</title>

function draw()

{

var canvas = document.getElementById(“c1”);

if (canvas.getContext) {

var c = canvas.getContext(“2d”);

c.fillStyle = “rgb(171,213,16)”;

c.fillRect(32, 32, 96, 96);

c.fillStyle = “rgba(255,0,102,0.75)”;

c.fillRect(64, 64, 96, 96);

}

</script>

two overlapping squares.

</canvas>

</body>

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62 HTML5 NOw

Let’s break this example down step-by-step. First, we’ll start with the

element itself:

two overlapping squares.

</canvas>

In this example, notice three important aspects of the

element:

■

attribute, which provides a simple hook for JavaScript code to refer

to it

■

The

width

and

height

attributes that indicate the dimensions of the can-

vas’s drawing area

■

Text fallback content inside for nonvisual browsers, and visual brows-

ers that either have scripting disabled or do not support the

element

Next let’s take a look at the

<body>

element surrounding the canvas:

two overlapping squares.

</canvas>

</body>

The only purpose the

<body>

element serves in this example is to call the

JavaScript function

draw()

after the document has ﬁnished loading.

eMplOyinG unObTruSive JavaScripT

Note that for the simplicity’s sake, the canvas example uses the inline event

handler attribute onload. In practice, however, you should assign all event handlers

dynamically, using the modern web developer practice of unobtrusive JavaScript.

For more on unobtrusive JavaScript, see the “Behavioral Separation” article at A List

Apart and the book DOM Scripting, both by Jeremy Keith:

http://www.alistapart.com/articles/behavioralseparation

http://domscripting.com

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11 HTML5 NaTivE vECTOr graPHiCs 63

Finally we get to where the action happens: the JavaScript that draws on the

canvas:

function draw()

{

var canvas = document.getElementById(“c1”);

if (canvas.getContext) {

var c = canvas.getContext(“2d”);

c.fillStyle = “rgb(171,213,16)”;

c.fillRect(32, 32, 96, 96);

c.fillStyle = “rgba(255,0,102,0.75)”;

c.fillRect(64, 64, 96, 96);

}

</script>

Let’s break down the

draw()

function even further:

var canvas = document.getElementById(“c1”);

Here’s where the

attribute on the

element comes in handy: The

ﬁrst thing the script does is get a reference to the canvas.

if (canvas.getContext) {

var c = canvas.getContext(“2d”);

The

test for

canvas.getContext

is effectively checking to see if the browser

supports the

element. If so, next it retrieves the canvas’s two-

dimensional (

“2d”

) drawing context. Which is the object that responds to

JavaScript drawing commands?

c.fillStyle = “rgb(171,213,16)”;

c.fillRect(32, 32, 96, 96);

The 2d drawing context offers many commands, two of which set the

fillStyle

and draw a rectangle with the

fillRect

function. You can set the

fillStyle

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64 HTML5 NOw

with an = assignment statement — in this case, to a solid green color using the

rgb()

syntax same as in CSS.

The

fillRect()

function takes four parameters, in order: the left, top, width, and

height of a rectangle. Combined, these two statements draw a solid green square:

c.fillStyle = “rgba(255,0,102,0.75)”;

c.fillRect(64, 64, 96, 96);

These next two lines of code do almost exactly the same thing except:

■

The

rgba()

function sets a partially transparent (75% opaque) pink

fillStyle

. The syntax for

rgba()

is reused from CSS color (http://

w3.org/TR/css3-color).

■

The

fillRect()

is nearly identical, with its top left offset down and to

the right.

Altogether, the example draws a solid green square, and then a slightly transpar-

ent pink square on top of it.

One of the best ways to learn is the time-honored web development practice of:

View source

. Copy/paste

Make some changes

See what happened

Repeat steps 3–4 as necessary to understand how the code works

Let’s copy/paste the

fillStyle/fillRect

lines of code to create another

square of a different color:

function draw()

{

var canvas = document.getElementById(“c1”);

if (canvas.getContext) {

var c = canvas.getContext(“2d”);

c.fillStyle = “rgb(171,213,16)”;

c.fillRect(32, 32, 96, 96);

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11 HTML5 NaTivE vECTOr graPHiCs 65

c.fillStyle = “rgba(255,0,102,0.75)”;

c.fillRect(64, 64, 96, 96);

c.fillStyle = “rgba(0,0,255,0.5)”;

c.fillRect(96, 96, 96, 96);

}

</script>

The new code we added sets the

fillStyle

to a

50% transparent blue, and then draws another

square 32 pixels down and to the right of the sec-

ond square.

But we’re not quite ﬁnished. One more bit to

update remains: the fallback text.

three overlapping squares.

</canvas>

Our complete updated example:

<!DOCTYPE html><meta charset=”utf-8”>

<title>Canvas example</title>

function draw()

{

var canvas = document.getElementById(“c1”);

if (canvas.getContext) {

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66 HTML5 NOw

var c = canvas.getContext(“2d”);

c.fillStyle = “rgb(171,213,16)”;

c.fillRect(32, 32, 96, 96);

c.fillStyle = “rgba(255,0,102,0.75)”;

c.fillRect(64, 64, 96, 96);

c.fillStyle = “rgba(0,0,255,0.5)”;

c.fillRect(96, 96, 96, 96);

}

</script>

three overlapping squares.

</canvas>

</body>

Numerous JavaScript drawing commands exist for the

element to per-

form all the usual graphics primitives, drawing and/or ﬁlling lines, paths, circles,

arbitrary polygons, etc. To learn more I recommend the Mozilla Developer

Center online canvas tutorial: https://developer.mozilla.org/en/Canvas_tutorial.

brOWSer SuppOrT

As with any graphical element, you must make sure to provide good fallback

content for browsers that don’t support

, for text browsers, for acces-

sibility, and of course, for search engines.

I recommend that you limit your use of

on production web sites to

decorative images only. This way, you can provide reasonably equivalent fall-

back content — for example by nesting an

<img>

element with

alt

text.

</canvas>

12 HTML5 NaTivE auDiO aND viDEO 67

Finally, do go ahead and experiment with the potential of

<canvas>,

building

more complex interactive pages that push the limits of what’s possible. My one

request is that while you’re designing such rich interactive experiences, keep

in mind — and simultaneously develop — similar interactive functionality with

semantic markup and forms as well.

Most of the beautiful canvas experiments to date have not bothered with

any kind of fallback or accessibility, and so consider this your opportunity to

create both beautiful and accessible experiences, because it is possible, espe-

cially when you do so from the start. These new vector graphics capabilities

in HTML5 are just one part of its new multimedia features, which also include

native audio and video support.

HTMl5 naTive audiO and videO

With the exception of low-quality animated GIFs and the proprietary

tag, HTML’s native multimedia support has been limited to static images. Nearly

all of the audio and video on the web has been handled by plug-ins, typically

Flash or QuickTime, until now. HTML5 introduces the

<audio>

and

<video>

ele-

ments, bringing rich declarative sound and motion to our otherwise static text

and graphics.

audiO and videO baSicS

In their simplest forms, both new tags work like the trusty

<img>

tag, with a

src

attribute for the URL of the audio or video ﬁle respectively — except that

both new tags have end tags as well.

Where the

<img>

tag has an

alt

attribute for a simple text alternate, the

<audio>

and

<video>

elements are containers, thus wrapping their fallback

alternate content.

68 HTML5 NOw

Joshua asks in a synthetic voice:

<samp>HOW ABOUT A NICE GAME OF CHESS?</samp>

</audio>

Video of Joshua simultaneously displaying on a terminal

while asking in a synthetic voice:

<samp>HOW ABOUT A NICE GAME OF CHESS?</samp>

</video>

One advantage of fallback content inside an element is that you’re able to use

additional markup, while attributes such as

alt

are limited to plain text content.

Note that the examples above use the

<samp>

rather than

<q>

tags as Joshua is

a computer program.

SuppOrTinG MulTiple fOrMaTS

The biggest challenge facing both

<audio>

and

<video>

elements is that there

is currently no single format (either audio or video) that is natively supported

across all browsers.

To demonstrate this, we’re going to code another example, this time using

some freely available open source/community video from the Internet Archive

(archive.org). To get started, download the following video ﬁles:

■

http://www.archive.org/download/Ryanne-BarCampSF816/Ryanne-

BarCampSF816.ogv

■

http://www.archive.org/download/Ryanne-BarCampSF816/Ryanne-

BarCampSF816_512kb.mp4

Rename your local copies to just

barcampsf.ogv

and

barcampsf.mp4

, respec-

tively. Doing so will keep our examples shorter/simpler.

12 HTML5 NaTivE auDiO aND viDEO 69

Note: As the earlier examples demonstrate, audio and video examples

are nearly identical. In the remaining examples, we’re going to focus on

video — although they all apply to audio with just a change in formats. Where

there are differences in browser support between H.264 (typically .mp4 ﬁles)

and Ogg Theora (.ogv ﬁles) formats in video, there are essentially the same

differences in browser support between MP3 (.mp3) and Ogg Vorbis (.ogv) in

audio.

Now back to a simple video example using these new ﬁles.

<!DOCTYPE html><meta charset=”utf-8”>

<title>video example</title>

A video showing BarCampSanFrancisco.

</video>

By default no controls are shown for video or audio. The expectation is that you,

the web designer, will build your own controls from HTML elements styled with

CSS, and wire them up to your audio and video elements with JavaScript. The

full DOM APIs for controlling the

<audio>

and

<video>

elements are listed in

the HTML5 speciﬁcation itself (and potentially in a bit of ﬂux). We’re going to

use the

controls

attribute to instruct the browser to give us a default set of

controls

so that we can focus on the content itself.

<!DOCTYPE html><meta charset=”utf-8”>

<title>video example</title>

A video showing BarCampSanFrancisco.

</video>

If you post this example to your web site along with the video ﬁle, you can

then view it using Safari, Chrome, or an iPad, as all of them use WebKit, which

supports HTML5 video and also supports the H.264 format. Here is how Safari

displays default video controls:

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