How do search engines treat pseudonyms (parallel parked domain)?

Question

Search Engine Optimization

Will both domains rank as one, or does it have to be a primary mirror? Is the secondary mirror lower in the search and should it be promoted separately? How much more justified is a redirect than an alias?

Answer 1

By the link to the sources I see:
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But only when you enter new input values, it does not erase the old values ​​that were written to the variable from previous actions.
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This is solved something like this:

var input= ...;
var X;
input.onchange= function() {
X= this.value;
}