Created
September 24, 2016 04:39
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function makeRandomColor() { | |
return '#' + Math.random().toString(16).substr(-6) | |
} | |
let tag = document.createElement('style') | |
tag.type = 'text/css' | |
tag.appendChild(document.createTextNode('')); | |
(document.head || document.getElementsByTagName('head')[0]).appendChild(tag) | |
let styleSheet = [...document.styleSheets].filter(x => x.ownerNode === tag)[0] | |
let group = document.createElement('div') | |
document.head.appendChild(group) | |
let current | |
let colours = Array.from({ length: 8000 }).map(makeRandomColor) | |
let rules = colours.map((c, i) => `._${i} { color: ${c}; }`) | |
console.profile('createTextNode') | |
rules.forEach((rule, i) => { | |
if (i % 40 === 0) { | |
current = document.createElement('style') | |
document.head.appendChild(current) | |
} | |
current.appendChild(document.createTextNode(rule)) | |
}) | |
console.profileEnd('createTextNode') | |
// console.profile('insertRule') | |
// rules.forEach(rule => styleSheet.insertRule(rule, styleSheet.cssRules.length)) | |
// console.profileEnd('insertRule') | |
// console.profile('insertAdjacentHTML') | |
// rules.forEach(rule => document.head.insertAdjacentHTML('beforeend', `<style>${rule}</style>`)) | |
// console.profileEnd('insertAdjacentHTML') | |
// console.profile('appendChild') | |
// rules.forEach((rule,i) => { | |
// if (i % 100 === 0) { | |
// current = document.createElement('div') | |
// group.appendChild(current) | |
// } | |
// let s = document.createElement('style') | |
// s.appendChild(document.createTextNode(rule)) | |
// current.appendChild(s) | |
// }) | |
// console.profileEnd('appendChild') | |
console.log(`Inserted ${rules.length} rules!`) | |
console.log(performance.now()) |
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