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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/DOMActivate_event below:

Element: DOMActivate event - Web APIs

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The DOMActivate event is fired at an element when it becomes active, such as when it is clicked on using the mouse or a keypress is used to navigate to it.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("DOMActivate", (event) => { })

onDOMActivate = (event) => { }

[...]

<svg
  xmlns="http://www.w3.org/2000/svg"
  version="1.2"
  baseProfile="tiny"
  xmlns:ev="http://www.w3.org/2001/xml-events"
  width="6cm"
  height="5cm"
  viewBox="0 0 600 500">
  <desc>Example: invoke an JavaScript function from a DOMActivate event</desc>

  <!-- JavaScript to change the radius -->
  <script>
    <![CDATA[ function change(evt) { const circle = evt.target; const
    currentRadius = circle.getFloatTrait("r"); if (currentRadius === 100) {
    circle.setFloatTrait("r", currentRadius * 2); } else {
    circle.setFloatTrait("r", currentRadius * 0.5); } } ]]>
  </script>

  <!-- Act on each DOMActivate event -->
  <circle cx="300" cy="225" r="100" fill="red">
    <handler type="text/javascript" ev:event="DOMActivate">
      change(evt);
    </handler>
  </circle>

  <text
    x="300"
    y="480"
    font-family="Verdana"
    font-size="35"
    text-anchor="middle">
    Activate the circle to change its size
  </text>
</svg>

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