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Define a "has listeners for" algorithm on EventTarget #660

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Define a "has listeners for" algorithm on EventTarget #660

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8aa03e8
define a "have a listener for" concept on EventTarget
gterzian Jun 28, 2018
3b25651
tweak wording
annevk Aug 13, 2018
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7 changes: 7 additions & 0 deletions dom.bs
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Expand Up @@ -995,6 +995,13 @@ and a <dfn export for=EventTarget>legacy-canceled-activation behavior</dfn> algo
<p class="note no-backref">These algorithms only exist for checkbox and radio <{input}> elements and
are not to be used for anything else. [[!HTML]]

<p>An {{EventTarget}} object <var>target</var> is said to <dfn export>have a listener for</dfn>
<var>type</var> if <var>target</var>'s <a>event listener list</a> <a for=list>contains</a> an
<a>event listener</a> whose <a for="event listener">type</a> is <var>type</var>.

<p class="note no-backref">The presence or absence of event listeners is not to be used when
designing new APIs; see [[#observing-event-listeners]].

<dl class=domintro>
<dt><code><var>target</var> = new <a constructor for=EventTarget lt=EventTarget()>EventTarget</a>();</code>
<dd><p>Creates a new {{EventTarget}} object, which can be used by developers to <a>dispatch</a> and
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