If content is set to yes, the web application runs in full-screen mode; otherwise, it does not. The default behavior is to use Safari to display web content.

You can determine whether a webpage is displayed in full-screen mode using the window.navigator.standalone read-only Boolean JavaScript property.

Available for iOS.

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This meta tag has no effect unless you first specify full-screen mode as described in apple-apple-mobile-web-app-capable.

If content is set to default, the status bar appears normal. If set to black, the status bar has a black background. If set to black-translucent, the status bar is black and translucent. If set to default or black, the web content is displayed below the status bar. If set to black-translucent, the web content is displayed on the entire screen, partially obscured by the status bar. The default value is default.

Available for iOS.

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By default, Safari on iOS detects any string formatted like a phone number and makes it a link that calls the number. Specifying telephone=no disables this feature.

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Use the viewport meta key to improve the presentation of your web content on iOS. Typically, you use the viewport meta tag to set the width and initial scale of the viewport.

For example, if your webpage is narrower than 980 pixels, then you should set the width of the viewport to fit your web content. If you are designing a Safari on iOS-specific web application, you should set the width to the width of the device.

Table 1 describes the properties supported by the viewport meta key and their default values. When providing multiple properties for the viewport meta key, you should use a comma-delimited list of assignment statements. Follow these rules when setting multiple properties:

• Do not use a semicolon as a delimiter.

• A space may work as a delimiter, but a comma is preferred.

• For numeric properties, if the value contains a nonnumeric character but starts with a number, then the number prefix is used as the value. For example, 1.0x is equivalent to 1.0 and 123x456 is equivalent to 123. If the parameter doesn’t begin with a number, the value is 0.

When referring to the dimensions of a device, you should use the constants described in Table 2 instead of hard-coding specific numeric values. For example, use device-width instead of 320 for the width, and device-height instead of 480 for the height in portrait orientation.

You do not need to set every viewport property. If only a subset of the properties are set, then Safari on iOS infers the other values. For example, if you set the scale to 1.0, Safari assumes the width is device-width in portrait and device-height in landscape orientation. Therefore, if you want the width to be 980 pixels and the initial scale to be 1.0, then set both of these properties.

For example, to set the viewport width to the width of the device, add this to your HTML file:

<meta name = "viewport" content = "width = device-width">

To set the initial scale to 1.0, add this to your HTML file:

<meta name = "viewport" content = "initial-scale = 1.0">

To set the initial scale and to turn off user scaling, add this to your HTML file:

<meta name = "viewport" content = "initial-scale = 2.3, user-scalable = no">

Use the Safari on iOS console to help debug your webpages as described in the Safari Web Inspector Guide. The console contains tips to help you choose viewport values—for example, it reminds you to use the constants when referring to the device width and height.

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