Use media query inline style [duplicate]

Answer 1

Not within an inline style declaration as far as I know.

However, if you're echoing from within PHP and really can't access the stylesheet I would suggest echoing an inline <style /> element with the media query and using a class for the div.

i.e.

<style type="text/css">
    .bg {
        background: url(background.jpg);
    }
    @media only screen and (max-device-width: 480px) { /* Change to whatever media query you require */
        .bg {
             background: url(background_highres.jpg);
        }
    }

</style>
<div class="bg">...</div>