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Is @media screen and (min-width: {PixelNumber}px) a "WebKit-only" CSS property?

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So I am testing my website in the Responsive Design-modus and there is no problem with the the CSS. But when I am at my phone the site shows me the CSS of desktop. He zooms in because of the viewport (I think). I do not know if this is the problem: https://support.mozilla.org/en-US/kb/web-pages-arent-displaying-properly-firefox-androi

CSS: @media screen and (min-width: {PixelNumber}px) { /* CSS stuf */ } /*or*/ @media only screen and (min-width: {PixelNumber}px) { /* CSS stuf */ }

HTML meta tag: <meta name="viewport" property="viewport" content="width-device-width, initial-scale=0.9">

The website: http://rwalstijn.mtdef.com/

The problem is happening on the following devices: sony xperia m5, Samsung Galaxy j5 2017

So I am testing my website in the Responsive Design-modus and there is no problem with the the CSS. But when I am at my phone the site shows me the CSS of desktop. He zooms in because of the viewport (I think). I do not know if this is the problem: https://support.mozilla.org/en-US/kb/web-pages-arent-displaying-properly-firefox-androi CSS: @media screen and (min-width: {PixelNumber}px) { /* CSS stuf */ } /*or*/ @media only screen and (min-width: {PixelNumber}px) { /* CSS stuf */ } HTML meta tag: <meta name="viewport" property="viewport" content="width-device-width, initial-scale=0.9"> The website: http://rwalstijn.mtdef.com/ The problem is happening on the following devices: sony xperia m5, Samsung Galaxy j5 2017

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