Can we use/make attached/detached method inside aurelia custom element?

I want to make custom element with attached/detached methods.
Is it a right way to add these methods inside custom element?

The issue names no files, tests, or entry points. First clarify whether attached and detached should be supported as Aurelia custom-element lifecycle hooks and what behavior is expected; then locate the custom-element lifecycle documentation or implementation and define a focused test that demonstrates completion.

Written by the indexing model from the issue text.