// save this as a bookmarklet. click it.
// if you want more/different elements, just edit the array
// (it's kinda near the end).

javascript:(function(){function addClientRectsOverlay(elt){var rects=elt.getClientRects();for(var i=0;i!=rects.length;i++){var rect=rects[i];var tableRectDiv=document.createElement('div');var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;var scrollLeft=document.documentElement.scrollLeft||document.body.scrollLeft;tableRectDiv.style.position='absolute';tableRectDiv.style.border='1px solid red';tableRectDiv.style.margin=tableRectDiv.style.padding=0;tableRectDiv.style.top=(rect.top+scrollTop)+'px';tableRectDiv.style.left=(rect.left+scrollLeft)+'px';tableRectDiv.style.width=(rect.width-2)+'px';tableRectDiv.style.height=(rect.height-2)+'px';document.body.appendChild(tableRectDiv);}}(function(){var elt=document.querySelectorAll(['p','div','ol','table','h1','h2','h3','h4','h5','h6']);for(var i=0;i<elt.length;i++){addClientRectsOverlay(elt[i]);};})();})();