setTextMapping(divs, texts) {
    this.textDivs = divs;
    this.textContentItemsStr = texts;
  }
Store two arrays that will map DOM nodes to text they should contain.
The arrays should be of equal length and the array element at each index
should correspond to the other. e.g.
`items[0] = "<span>Item 0</span>" and texts[0] = "Item 0";

@param {Array<Node>} divs
@param {Array<string>} texts