davidgilbertson

@mixin for-phone-only {
  @media (max-width: 599px) { @content; }
}
@mixin for-tablet-portrait-up {
  @media (min-width: 600px) { @content; }
}
@mixin for-tablet-landscape-up {
  @media (min-width: 900px) { @content; }
}
@mixin for-desktop-up {

mahemoff

<!-- This is a Node+WebSocket powered demo to sync videos
     across different browsers. This file is the client,
     the other one is the Node server. Powered by Node and
     http://github.com/miksago/node-websocket-server -->

<style>
  .inactive { display: none; }
  .active { display: block; }
</style>
<script>