Home
The idea behind Canary is to extend the functionality of Lovelace in a non-drastic way. This is done mainly, by adding extra configuration options (extensions) to pre-existing Lovelace elements.
This plugin could be thought of as almost a staging ground for features that if suitable could end up in core Lovelace, hence the name borrowed from Chrome Canary. It's unclear how well that statement will hold, it could also be called "Extensions".
Much like card-mod Canary extends the default lovelace cards, so you don't need to actually define a canary-card for these options to work. The options are added to their respective cards as 'extensions'.