An example one-liner to annotate all 'p' and 'a' tags in the current page. Paste it into the devtools. (if you trust the 'rough-notation' module)

rough-notation-devtools-oneliner.js

(async () => {
    const RoughNotation = await import('https://unpkg.com/rough-notation?module');

    const pick = (arr) => arr[Math.floor(Math.random() * arr.length)];
    const colorNames = "#66FF66 #FD5B78 #FF9966 #FFFF66 #50BFE6 #FF00CC".split(" ");

    document.querySelectorAll('p').forEach(elem => {
        RoughNotation.annotate(elem, { type: 'box', color: 'black', strokeWidth: pick([1, 2, 10]) }).show();
    });
    document.querySelectorAll('a').forEach(elem => {
        RoughNotation.annotate(elem, { type: 'highlight', color: pick(colorNames) }).show();
        elem.style.color = 'black';
    });
})()