Try imagining the possibilities when using validation-capable inputs other that checkboxes and radios, too. How about a range slider, or a text input with a validation regex...
For further inspiration, I recommend reading the entirety of the HTML Living Standard and the current CSS Snapshot about once a year. I'm currently excited about the opportunities for [open], particularly with the <details> and <dialog> elements.
My biggest disappoints of the year are with <datalist>, unfortunately, which is so mysteriously half-baked it's practically worthless; followed by Webkit dragging its heels over <dialog> support and customized built-in element support.
For further inspiration, I recommend reading the entirety of the HTML Living Standard and the current CSS Snapshot about once a year. I'm currently excited about the opportunities for [open], particularly with the <details> and <dialog> elements.
My biggest disappoints of the year are with <datalist>, unfortunately, which is so mysteriously half-baked it's practically worthless; followed by Webkit dragging its heels over <dialog> support and customized built-in element support.