JSFiddle - React, Tailwind, and code Playground

HTML

<p><span rtenodeid="3" id="ms-rterangecursor-start"></span><span id="ms-rterangecursor-end"></span><span id="ms-rterangepaste-start"></span><span id="ms-rterangepaste-end"></span></p><div style="width: 1px; height: 1px; overflow: hidden;" class="ms-rte-pasteremove" contenteditable="true"><img src="data:image/png;base64,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" alt=""></div>

JavaScript

function getBase64Imgs()
{
  var b64i = [];
  var imgs = document.querySelectorAll('img');
  if(imgs.length>0)
  {
    for(var i in imgs)
    {
      if(typeof imgs[i].hasAttribute == 'function')
      {
        if(imgs[i].hasAttribute('src'))
        {
          if(imgs[i].getAttribute('src').match(/^data:image\/[^;]+;base64,/i))
            b64i.push(imgs[i]);
        }
      }
    }
  }
  return b64i;
}

console.log(getBase64Imgs());