HTML and CSS Reference
In-Depth Information
The Viewport meta Element
The viewport meta element was introduced by Apple for use with the iPhone as a way
of setting the properties of the layout viewport. Although not part of the HTML specifica-
tions, most current mobile browsers support this meta element, which has the syntax
<meta name=”viewport” content=” properties ” />
where properties is the media features of the layout viewport. Web designers may
choose different widths and heights based on the content of the pages on their Web sites.
Kevin wants a layout viewport that matches the width of the device screen. To accom-
plish this, you'll apply the following meta element to his document:
<meta name=”viewport” content=”width=device-width, initial-
scale=1.0, maximum-scale=1.0” />
In this meta element, the device-width keyword is used to return the width of the
device's screen, whatever that may be. For a mobile device like the iPhone, this sets
the width of the layout viewport to 320 pixels; other devices have different widths. The
initial-scale and maximum-scale parameters are set to 1 so that the page layout is
always scaled to match the resolution of the device screen. You'll add this meta element
to Kevin's document now.
To add the viewport meta element:
1. Return to the treebook.htm file in your text editor.
2. Directly below the meta element that defines the character set, add the following
element as shown in Figure 8-50:
<meta name=”viewport” content=”width=device-width,
initial-scale=1.0, maximum-scale=1.0” />
figure 8-50
Adding the viewport meta element
3. Save your changes to the file.
Now that you've set the width of the layout viewport to match the device width, you'll
begin creating a style sheet for your mobile devices. You'll add this style sheet now.
To create the mobile style sheet:
1. Use your text editor to open the mobiletxt.css file from the tutorial.08/tutorial
folder. Enter your name and the date in the comment section of the file.
2. Save the file as mobile.css .
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