<p></p>
<blockquote>
<p dir="auto">Also that code looks like it has lots of quite modern javascript in it and I'm not sure what our policy is on what our maximum allowed syntax level is.</p>
</blockquote>
<p dir="auto">This is probably the main point:<br>
<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#browser_compatibility" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#browser_compatibility</a><br>
Removing support for non-chrome-edge and other browsers which are older than 3.5 years.</p>
<p dir="auto">But: Browsers without support will fail on parse of the <code class="notranslate"><script></code> tag and fall back to behaviour which is live now "no direct user check".</p>

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