montogeek

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

montogeek

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

montogeek

UPDATE personas 
SET 
  updated_at = (
                  SELECT  personas_23_dic.updated_at 
                  FROM personas_23_dic 
                  WHERE DATE(personas.updated_at) = '2013-12-24' and personas.id = personas_23_dic.id
                ) 
                WHERE EXISTS (
                              SELECT * 
                              FROM personas_23_dic.id = personas.id

montogeek

/**
 * Typing animation with pure CSS. 
 * Works best in browsers supporting the ch unit.
 */

@keyframes typing { from { width: 0; } }
@keyframes blink-caret { 50% { border-color: transparent; } }

h1 { 
	font: bold 200% Consolas, Monaco, monospace;