レスポンシブではみ出した要素の検出

助かったー
横スクロール　はみ出し要素検出
http://netkansai.com/contents/index.php?id=57



function getwidth(){

  'use strict';

  const bodyElem = document.getElementsByTagName("body");

  const bodyWidth = window.getComputedStyle(bodyElem[0],null).getPropertyValue("width");

  const numBodyWidth = parseInt(bodyWidth);

  console.log("body:",numBodyWidth);


  const tags = document.querySelectorAll("*");

  for(let i=0; i < tags.length; i++){
    let tagMargingLeft = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("margin-left"));
    let tagMarginRight = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("margin-right"));
    let tagPaddingLeft = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("padding-left"));
    let tagPaddingRight = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("padding-right"));
    let tagBorderLeft = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("border-left"));
    let tagBorderRight = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("border-right"));
    let tagWidth = parseInt(window.getComputedStyle(tags[i],null).getPropertyValue("width"));
    let tagBoxSizing = window.getComputedStyle(tags[i],null).getPropertyValue("box-sizing");
    if(tagBoxSizing === "content-box"){
      var sumWidth = tagMargingLeft + tagMarginRight + tagBorderLeft + tagBorderRight + tagPaddingLeft + tagPaddingRight + tagWidth;
    }else{
      var sumWidth = tagMargingLeft + tagMarginRight + tagWidth;
    }
    if(numBodyWidth < sumWidth){
    console.log(tags[i],":",sumWidth,);
      console.log("marginl-left:",tagMargingLeft);
      console.log("border-left:",tagBorderLeft);
      console.log("padding-left:",tagPaddingLeft);
      console.log("width:",tagWidth);
      console.log("padding-left:",tagPaddingRight);
      console.log("border-left:",tagBorderRight);
      console.log("marginl-left:",tagMarginRight);
    }
  }
}
window.addEventListener("load", getwidth, false);
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