css3 - What does @media screen and (max-width: 1024px) mean in CSS? -

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i found piece of code in css file inherited, can't make sense out of it:

@media screen , (max-width: 1024px){     img.bg {         left: 50%;         margin-left: -512px; } }

specifically, happening on first line?

that’s media query. prevents css inside being run unless browser passes tests contains.

the tests in media query are:

  1. @media screen — browser identifies being in “screen” category. means browser considers desktop-class — opposed e.g. older mobile phone browser (note iphone, , other smartphone browsers, do identify being in screen category), or screenreader — , it’s displaying page on-screen, rather printing it.

  2. max-width: 1024px — width of browser window (including scroll bar) 1024 pixels or less. (css pixels, not device pixels.)

that second test suggests intended limit css ipad, iphone, , similar devices (because older browsers don’t support max-width in media queries, , lot of desktop browsers run wider 1024 pixels).

however, apply desktop browser windows less 1024 pixels wide, in browsers support max-width media query.

here’s media queries spec, it’s pretty readable:


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