How to find the nearest common ancestors of two or more nodes?

Question

Users selects two or more elements in a HTML page. What i want to accomplish is to find those elements\' common ancestors (so body node would be the common ancestor if none

Answer 1

did not liked any of the answers above(want pure javascript and one function). that worked perfectly for me,efficient and also easier to understand:

    const findCommonAncestor = (elem, elem2) => {
      let parent1 = elem.parentElement,parent2 = elem2.parentElement;
      let childrensOfParent1 = [],childrensOfParent2 = [];
      while (parent1 !== null && parent2 !== null) {
        if (parent1 !== !null) {
          childrensOfParent2.push(parent2);
          if (childrensOfParent2.includes(parent1)) return parent1;
        }
        if (parent2 !== !null) {
          childrensOfParent1.push(parent1);
          if (childrensOfParent1.includes(parent2)) return parent2;
        }
        parent1 = parent1.parentElement;
        parent2 = parent1.parentElement;
      }
      return null;
    };