Get html from clipboard with js

html_clipboard.js

document
    // can be any element that knows how to recieve the paste event
    .getElementById('someElement')
    // add event listener
    .addEventListener('paste', e => {
        if (! e.clipboardData.types.includes('text/html')) {
          // if there's no html on the clipboard ignore it
          return;
        }

        // use <template> to convert the html string to a DOM tree
        const tpl = document.createElement('template');

        // get clipboard content (always trim to avoid creating empty text nodes)
        tpl.innerHTML = e.clipboardData.getData('text/html').trim();

        // get html as DOM elements
        const html = tpl.content.children;

        // do something with it...

        // if you don't want to paste the text version of the clipboard, prevent the default action
        e.preventDefault();
    });