Developers sometimes ask about handling devices with different screen sizes, and whether that was something you’d could do with media queries in addition to the media queries for the different view states (snapped, filled, fullscreen-landscape, and fullscreen-portrait).

The answer is really to use adaptive (aka responsive) layout techniques with CSS so that you don’t really worry about screen size—you’re typically only writing media queries for the view states, since the relative positioning of items in the page layout can change quite a bit between them. In those view state media queries, you might be changing the size of an element that contains a grid layout div, or that of a ListView, or some other control, where that size change will trigger a resize event that a control like ListView picks up to refresh its layout. Apps also use the same event to change the layout of a ListView according to view state, such as switching between GridLayout (2D) and ListLayout (1D, vertical).

It’s worth noting that inside media queries there are the vh and vw units (viewport height and viewport width) that can be used like px, em, etc. That is, saying height: 6.5vh in CSS will give you 6.5% of the height of the app window. You can certainly accomplish the same thing with a CSS grid, where you know that certain fractional rows/columns will essentially come out the same thing. For example, if you have a grid that’s styled to 100% width and height, and use –ms-grid-columns: 1fr 1fr 1fr 1fr; that’d be the same as using –ms-grid-columns: 25vw 25vw 25vw 25vw. Or –ms-grid-columns: 25% 25% 25% 25%. But if that element was only 50% width, then the 1fr and 25% values will scale, but the 25vw would not, unless the display width itself changed.

I mention those because if you have layout that’s not strictly proportional and does depend on screen dimensions, you can use vh and vw like this, or you can standard media queries against width and height, combined with the view states, as needed. For example, say in snap view you’ll have your base layout for a 768 vertical dimension, but if you’re on something greater than, say, 1200, you might want to include another piece of information in the header or such. In that case, the extra element would be present in the HTML, then you’d have a media query like this:

@media screenand(-ms-view-state: snapped) and (max-height: “1199px”) {

wherein you might set display: none for that extra element.

Within JavaScript you can also obtain window and element dimensions as you need them if you’re working with layout programmatically (such as cases where you need to do some extra computation).

So it really depends on what you need to do, layout-wise, but the platform can provide all the information you need both declaratively and programmatically. You can also use Media Query Listeners (another W3C standard) to get events for view state changes.

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