Make GIF playback controllable

https://doc-snapshots.qt.io/qt5-5.6/qml-qt-labs-controls-button.html, for example, has a looping GIF that plays automatically. This is probably fine, but if you had a couple of GIFs on a page that were all visible at once (not unreasonable, especially if you're using them to compare something), it can get quite chaotic. It would be great to have a "play" icon over each GIF displayed in the documentation, that, when clicked, would play the GIF in a loop, just like Google's Material Design spec:

https://www.google.com/design/spec/components/buttons.html#buttons-flat-buttons