Get the inner text of an element:

var element = document.getElementById("someId").innerText
let myContent = element.innerText;

find element using  using inner text

var totalElements = document.getElementsByClassName("some");

var found = false;

for (var i = 0; i < totalElements.length; i++) {
  if (totalElements[i].textContent.includes('Is this content exists')) {
    found = totalElements[i];
    break;
  }
}

/// element that found

console.log(found);

To  get element by attribute in JavaScript

document.querySelector("[data='1']");

:)