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Re:The broken promise of Web Components by bijection on Wednesday March 15, 2017 @06:39PM (#13880550)
Also, for whatever it's worth, the js could be written more concisely as

  ['Hello', 'world'].forEach( text => MyComponent
      .appendChild(document.createElement('p'))
      .appendChild(document.createElement('span'))
      .textContent = text
  )
Re:The broken promise of Web Components by danabramov on Thursday March 16, 2017 @07:07AM (#13884057)
This doesn't really help you with updates at all, only with initial mounting. In React, elements describe the current tree, and React figures out how to apply changes between the trees.