vczhan

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()

vczhan

// Gulp 4
var gulp = require('gulp');
var using = require('gulp-using');
var grep = require('gulp-grep');
var changed = require('gulp-changed');
var del = require('del');
var coffee = require('gulp-coffee');
var less = require('gulp-less');
var coffeelint = require('gulp-coffeelint');
var sourcemaps = require('gulp-sourcemaps');