Echo JS 0.11.0

I can say it's definitely not JavaScript.

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IIRC noreferrer is now redundant, and noopener is sufficient in HTML.

I don't see how this post could have 9 upvotes in such a short time. Quite suspect to say the least.

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Off topic

PSA: use only #2.
If you *really* need it, put a warning comment for #1.
Avoid #3 (unless you're generating code), and for #4 use Number rather than an easy-to-miss unary operator.

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