Chonny Chu FallOutChonny

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

Hello, visitors! If you want an updated version of this styleguide in repo form with tons of real-life examples… check out Trellisheets! https://github.com/trello/trellisheets

Trello CSS Guide

“I perfectly understand our CSS. I never have any issues with cascading rules. I never have to use !important or inline styles. Even though somebody else wrote this bit of CSS, I know exactly how it works and how to extend it. Fixes are easy! I have a hard time breaking our CSS. I know exactly where to put new CSS. We use all of our CSS and it’s pretty small overall. When I delete a template, I know the exact corresponding CSS file and I can delete it all at once. Nothing gets left behind.”

You often hear updog saying stuff like this. Who’s updog? Not much, who is up with you?

	import React, { forwardRef } from 'react'
	import styled from 'styled-components'
	import css, { get } from '@styled-system/css'
	import {
	system,
	compose,
	space,
	color,
	typography,
	layout,

	// @ts-check
	import { useState, useEffect } from 'react'

	function getCurrentLocation () {
	return {
	pathname: window.location.pathname,
	search: window.location.search
	}
	}

	""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
	" Font
	:set guifont=Source\ Code\ Pro:h14

	""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
	" Hide pointless junk at the bottom, doesn't work in .vimrc for some reason?
	:set laststatus=0
	:set noshowmode "don't show --INSERT--
	:set noruler "don't show line numbers/column/% junk

	let UserContext = React.createContext();

	class App extends React.Component {
	state = {
	user: null,
	setUser: user => {
	this.setState({ user });
	}
	};

	{
	"scripts": {
	"dev": "webpack-dev-server --hot --open",
	"dist": "rm -rf public && NODE_ENV=production webpack --config webpack-dist.config.js --display-optimization-bailout",
	"jbdist": "tnpm i && NODE_ENV=production webpack --config webpack-dist.config.js"
	},
	"dependencies": {
	"babel-runtime": "^6.23.0",
	"badjs-report": "^1.3.2",
	"classnames": "^2.2.5",

	// getComponent is a function that returns a promise for a component
	// It will not be called until the first mount
	function asyncComponent(getComponent) {
	return class AsyncComponent extends React.Component {
	static Component = null;
	state = { Component: AsyncComponent.Component };

	componentWillMount() {
	if (!this.state.Component) {
	getComponent().then(Component => {

	import { Modal } from 'react-bootstrap'
	import ModalDialog from 'react-bootstrap/lib/ModalDialog'

	class DraggableModalDialog extends React.Component {
	render() {
	return <Draggable handle=".modal-title"><ModalDialog {...this.props} /></Draggable>
	}
	}

	// enforceForce=false causes recursion exception otherwise....

	var Col = require('react-bootstrap/lib/Col')
	var PageHeader = require('react-bootstrap/lib/PageHeader')
	var React = require('react')
	var Row = require('react-bootstrap/lib/Row')
	var {connect} = require('react-redux')
	var {reduxForm} = require('redux-form')

	var DateInput = require('./DateInput')
	var FormField = require('./FormField')
	var LoadingButton = require('./LoadingButton')