🚨 Error: i.hasAttribute is not a function

Details
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**Error report:** [link](http://go/ampe/CLaynP7S25nSswE)
**First seen:** Oct 14, 2020
**Frequency:** ~ 329,769/day

Stacktrace
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Error: i.hasAttribute is not a function

    at hasAttribute (src/input.js:196:15)

Notes
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`@rsimha` modified `src/input.js:190-197` in [#21212](https://github.com/ampproject/amphtml/pull/21212) (May 16, 2019)

**Seen in:**
- 03-10 Stable (1844)

/cc @ampproject/release-on-duty

Start by reading src/input.js around lines 190-197 and the change discussed in pull request #21212. Trace the reported hasAttribute call and determine how to verify the production error is no longer triggered; done means the failure is addressed and the reported behavior is covered by an appropriate check.

Written by the indexing model from the issue text.