Re: [heycam/webidl] Modernize invoking user code (#113)

>            </p>
>            <ol class="algorithm">
>              <li>Try running the following steps:
>                <ol>
> -                <li>Let <var>V</var> be the IDL <a class="dfnref" href="#idl-interface">callback interface type</a> value
> -                  that represents the <a class="dfnref" href="#dfn-user-object">user object</a> implementing the <a class="dfnref" href="#dfn-interface">interface</a>.</li>
> -                <li>Let <var>O</var> be the ECMAScript object corresponding to <var>V</var>.</li>
> -                <li>Let <var>P</var> be the <a class="dfnref" href="#dfn-identifier">identifier</a> of the attribute.</li>
> -                <li>Let <var>script</var> be the <a class="dfnref" href="#dfn-callback-context">callback context</a> associated with <var>V</var>.</li>
> -                <li>Push <var>script</var> on to the <a class="dfnref external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html">stack of incumbent scripts</a>. <a href="#ref-HTML">[HTML]</a></li>
> +                <li>Let <var>O</var> be the ECMAScript object corresponding to <var>object</var>.</li>
> +                <li>Let <var>execution context</var> be <var>object</var>'s <a class="dfnref" href="#dfn-callback-context">callback context</a>'s <a class="dfnref external" href="https://html.spec.whatwg.org/multipage/webappapis.html#settings-object">settings object</a>'s <a class="external" href="https://html.spec.whatwg.org/multipage/webappapis.html#realm-execution-context">realm execution context</a>.</li>
> +                <li>Increment <var>execution context</var>'s <a class="external" href="https://html.spec.whatwg.org/multipage/webappapis.html#entrance-counter">entrance counter</a> by one.</li>

So the problem here is I don't know what to set up as the entry settings. There's no obvious function to get a realm from. Should we assume every object has a realm, and use that? Not sure what to do here.

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