Best I can do for hacker news. You'll have to copy it into your browser's javascript console, or prepend javascript: and save it as a bookmarklet. Array.protot

Best I can do for hacker news. You'll have to copy it into your browser's javascript console, or prepend javascript: and save it as a bookmarklet. Array.prototype.slice.call(document.getElementsByTagName('font')).forEach(function(i){i.innerHTML = i.innerHTML.split(' ').reduce(function(acc, cv, i, a) {if (i % 5 == 0) return acc + '<span style="background-color: black;">' + cv + ' </span>'; else return acc + cv + ' '; }, '');})