The @viewport tag is malfunctioning on iOS devices when used in CSS

Due to certain limitations, I am unable to make any changes to the HTML code of the project I am currently working on. As a result, I am unable to include the following attribute:

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

I attempted to address this issue in my CSS file with the following code:

@viewport {
    width: device-width;
    zoom: 1;
}

However, it seems that this solution did not produce the desired outcome. When testing on an iPhone, the breakpoints were still incorrect. It appears that this feature may not be supported by browsers yet.

If achieving this through CSS is not feasible, is there a way to set this in a server side header? For instance, in the case of Internet Explorer, I added X-UA-Compatible:IE=Edge,chrome=1 to the Apache response header. Can a similar approach be taken for the viewport tag?

htmlioscss

Answer №1

If you want to ensure cross-browser compatibility, consider using vendor prefixes:

@-wekbit-viewport {
    width: device-width;
    zoom: 1;
}
@-ms-viewport {
    width: device-width;
    zoom: 1;
}
@-o-viewport {
    width: device-width;
    zoom: 1;
}
@viewport {
    width: device-width;
    zoom: 1;
}

Keep in mind that Firefox and Safari currently do not support the @viewport CSS.

Visit MDN Docs for more information.

If you are using server side technology, you can add the following code to your .htaccess file:

<FilesMatch "\.(htm|html|php)$">
    <IfModule mod_headers.c>
        BrowserMatch MSIE ie
        Header set X-UA-Compatible "IE=Edge,chrome=1" env=ie
    </IfModule>
</FilesMatch>

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