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森建 (moriken@social.kimamass.com)'s status on Tuesday, 20-Nov-2018 18:03:36 JST 森建

ParentNode#childElementCount とか NonDocumentTypeChildNode#previousElementSibling とか知らない DOM API がまだまだあるなぁ。
https://developer.mozilla.org/en-US/docs/Web/API/ParentNode/childElementCount
https://developer.mozilla.org/en-US/docs/Web/API/NonDocumentTypeChildNode/previousElementSibling
In conversation Tuesday, 20-Nov-2018 18:03:36 JST from social.kimamass.com permalink
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  ParentNode.childElementCount
  
  from MDN Web Docs
  
  The ParentNode.childElementCount read-only property returns an unsigned long representing the number of child elements of the given element.
2. Domain not in remote thumbnail source whitelist: developer.mozilla.org
  
  NonDocumentTypeChildNode.previousElementSibling
  
  from MDN Web Docs
  
  The NonDocumentTypeChildNode.previousElementSibling read-only property returns the Element immediately prior to the specified one in its parent's children list, or null if the specified element is the first one in the list.

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