The `:` in template event bindings is required or not

[LastLeaf]

This should be made clear in documentation.

[LastLeaf]

The legacy bindxxx syntax without : is only valid in these conditions.

• For component tags, it is valid, but can be overrided by component properties. For example:

  <my-component bindtap="func" />

  This will be treated as bind:tap , unless bindtap is a component property of my-component .

• For native node tags, it is valid only when fallbackListenerOnNativeNode is set in the user's template configuration. This configuration can be set like this:

  Component({ template: { fallbackListenerOnNativeNode: true, /* compiled template body */ } })

  It is NOT recommanded since it disables any attribute names started with bind catch on .

• Invalid on other tags.

[LastLeaf]

It is recommanded that : should ALWAYS be added for event bindings. It makes code clear and results in better compilation results.