javascript - Why does window.screen not work on macOS safari - Stack Overflow

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So I'm trying to redirect mobile pages on my website. If someone is on a mobile device then it would send them to the mobile site rather than the desktop site. It works on Chrome. However, it is not working on macOS Safari. Any idea why? The JavaScript is below:

<script>
        if (screen.width <= 420) {
        document.location="mobileindex.html";
    }
</script>

So I'm trying to redirect mobile pages on my website. If someone is on a mobile device then it would send them to the mobile site rather than the desktop site. It works on Chrome. However, it is not working on macOS Safari. Any idea why? The JavaScript is below:

<script>
        if (screen.width <= 420) {
        document.location="mobileindex.html";
    }
</script>

• javascript
• html
• safari

Share Improve this question Follow edited Mar 2, 2018 at 21:55 toastrackengima 8,76244 gold badges5353 silver badges6262 bronze badges asked Mar 2, 2018 at 21:38 Gib CannonGib Cannon 5311 silver badge77 bronze badges

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1 Answer 1

Sorted by: Reset to default 10

screen.width returns the width of the screen, not the browser window. This is good as it means that we can't falsely redirect users to the mobile site.

In Chrome, we can test that our logic works using the Device Emulator. When a page is loaded in the Device Emulator, screen.width returns the width of the device being emulated, rather than the host puter's screen.

However, in Safari, the corresponding Responsive Design Mode does not work this way. screen.width will always return the width of the puter monitor in Safari, not the width of the emulated device.

In other words, this is a problem with Safari's implementation, not your code. It will work fine on an actual mobile device.

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