Method setHTMLAttributeAtPosition

src/trix/models/document.js:285–289

(position, name, value)

  }

  setHTMLAttributeAtPosition(position, name, value) {
    const block = this.getBlockAtPosition(position)
    const updatedBlock = block.addHTMLAttribute(name, value)
    return this.replaceBlock(block, updatedBlock)
  }

  insertBlockBreakAtRange(range) {
    let blocks