Combining media queries

It's also possible to string multiple expressions together. For example, let's extend one of our prior examples and also limit the file to devices that have a viewport greater than 800 pixels.

<link rel="stylesheet" media="screen and (orientation: portrait) and (min-width: 800px)" href="800wide-portrait-screen.css" />

Further still, we could have a list of media queries. If any of the listed queries are true, the file will be applied. If none are true, it won't. Here is an example:

<link rel="stylesheet" media="screen and (orientation: portrait) and (min-width: 800px), projection" href="800wide-portrait-screen.css" />

There are two points to note here. Firstly, a comma separates each media query. Secondly, you'll notice that after projection, there is no trailing and/or feature/value combination in parentheses. That's because in the absence of these values, the media query is applied to all media types. In our example, the styles will apply to all projectors...