SVGElement: unload event

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unload event is fired when the DOM implementation removes an SVG document from a window or frame.

svgElem.addEventListener('unload', () => {
  console.log('SVG unloaded.');
})

规范	状态	注释
Scalable Vector Graphics (SVG) 2 The definition of 'unload' in that specification.	候选推荐	初始定义

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