Highlight certain words in Text

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This is the whole code.

let eRFullText;
let eRShortText;
let eRtxt1;
let eRtxt2;
let eRtxt3;
let eRtxt4;

$w.onReady(function () {
 const shortTextLength = 700;
 let item = $w("#dynamicDataset").getCurrentItem();

 if(item.emissionsReduction !== "")
    eRtxt1 = item.emissionsReduction;
 if(item.emissionsReduction2 !== "")
    eRtxt2 = item.emissionsReduction2;
 if(item.emissionsReduction3 !== "")
    eRtxt3 = item.emissionsReduction3;
 if(item.emissionsReduction4 !== "")
    eRtxt4 = item.emissionsReduction4;
  eRFullText = eRtxt1 + eRtxt2 + eRtxt3 + eRtxt4;
 if(eRFullText === "undefined") {
    eRFullText = "na";
    $w("#text65").text = eRFullText;
  }
 if(eRFullText !== "" && eRFullText !== "na") {
    eRShortText = eRFullText.substr(0, shortTextLength) + "...";
    $w("#text65").text = eRShortText;
  }
 let newWord = "carbon";
  $w("#text65").html = $w("#text65").html.replace(/carbon/gi, `<mark>${newWord}</mark>`);
  });
  
  export function button11_click(event) {
 if ($w("#text65").text === eRShortText) {
  $w("#text65").text = eRFullText;    
} else {
  $w("#text65").text = eRShortText;
}
}