Can a viewport be defined exclusively for iOS using CSS, without the need for meta-tags?

On a page where I can only modify CSS and not HTML, using viewport is essential. This means that inserting the well-known meta-tag is not an option.

The only potential solution I have discovered so far is:

@viewport {
    width: device-width;
    initial-scale: 1;
    zoom: 1;
    min-zoom: 1;
    max-zoom: 2;
    zoom: fixed;
}

Unfortunately, this method did not yield the desired outcome as it maintained the same width even when rotating the device.

Does anyone have any suggestions on what adjustments should be made? Is achieving the desired result even possible?

ioscssviewport

Answer №1

At the time of writing in December 2013, the CSS Device Adaption feature (including @viewport) was not fully developed and lacked widespread browser support. This means that currently, it is not possible to set a viewport for iOS using only CSS.

Browser support:

  • Internet Explorer 10 (msdn.microsoft.com) – vendor-prefixed: @-ms-viewport
  • Opera Mobile 11 (dev.opera.com) – vendor-prefixed: @-o-viewport

For further information:

  • html5hacks.com: Elegantly Resize Your Page With the @-viewport CSS Declaration
  • treehouse blog: CSS Device Adaptation With @viewport
  • According to the Bootstrap documentation, IE10 in Windows 8 and Windows Phone 8 require some fixes to function correctly:

Internet Explorer 10 in Windows 8 and Windows Phone 8

Internet Explorer 10 does not distinguish between device width and viewport width, leading to issues with applying media queries in Bootstrap's CSS. To address this, additional CSS and JavaScript adjustments are necessary until Microsoft releases a fix.

@-webkit-viewport   { width: device-width; }
@-moz-viewport      { width: device-width; }
@-ms-viewport       { width: device-width; }
@-o-viewport        { width: device-width; }
@viewport           { width: device-width; }

JavaScript adjustments:

if (navigator.userAgent.match(/IEMobile/10.0/)) {
  var msViewportStyle = document.createElement("style")
  msViewportStyle.appendChild(
    document.createTextNode(
      "@-ms-viewport{width:auto!important}"
    )
  )
  document.getElementsByTagName("head")[0].appendChild(msViewportStyle)
}

For more details on addressing these issues, refer to Windows Phone 8 and Device-Width.

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