Examples · Basics
Counter
A signal in a template: the smallest possible component.
A signal holds state, html`` renders it. ${count} is live because it is the signal itself, not its value: the text node updates in place, nothing else re-renders.
What to notice
${count}is a subscription;${count.value}would be a one-time snapshot (the dev build warns about it as E019).mount()gives the setup a scope: every effect and listener created here dies with the component.- There is no render function to call again. The template is parsed once, the binding updates the text node.
Change ${count} to ${count.value} and click: the number stops updating.