transform-origin example is broken

[wbamberg]

The examples in the interactive example at https://developer.mozilla.org/en-US/docs/Web/CSS/transform-origin are supposed to rotate, but they don't any more. I don't know which other interactive examples might also be broken in this way.

[lionel-rowe]

It looks like it's due to the example code blocks being hydrated into codemirror editor components. transform-origin.js looks for .selected code's data-animation attribute, but .selected code no longer exists as it's been overwritten by the editor component.

Possibly attaching the data- attributes to the parent div.example-choice instead of the child code elements would fix it.