so there's no built-in mechanism in material-design-lite
v1.x for "chips" or lists to be attached to an input/search field, and/or be populated/displayed in response to an event.
I found this: http://immybox.js.org/ — but is there a best practice in general for MDL, with autocomplete/search suggest?
Or, something like Google/YouTube search bar in MDL?
There is a thread on this here: Component Request Autocomplete · Issue #877 · google/material ...
To answer your question
is there a best practice in general for MDL, with autocomplete/search suggest?
It is according to that, officially unresolved. Which is annoying because it would be really great, especially with chip integration like a cross between these two:
Angular Material Autocomplete & Angular Material Chips
Angular Material
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