paulirish

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

midoriberlin

<link rel=”shortcut icon” href=”http://www.domain.com/favicon.ico” type=”image/x-icon” />
<link rel=”icon” href=”http://www.domain.com/favicon.ico” type=”image/x-icon” />

sebmarkbage

import { Component } from "React";

export var Enhance = ComposedComponent => class extends Component {
  constructor() {
    this.state = { data: null };
  }
  componentDidMount() {
    this.setState({ data: 'Hello' });
  }
  render() {

bobbygrace

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?

p3t3r67x0

Styling native elements

Native HTML controls are a challenge to style. You can style any element in the web platform that uses Shadow DOM with a pseudo element ::pseudo-element or the /deep/ path selector.

video::webkit-media-controls-timeline {
  background-color: lime;
}

video /deep/ input[type=range] {

oroce

var fs = require('fs');
var jade = require('jade');
require.extensions['.jade'] = function(module, data) { 
  var content = fs.readFileSync(module.filename);
  var str = 'module.exports = ' + jade.compile(content, {filename: module.filename});
  console.log(module.filename, str); 
  return module._compile(str, data);
};

hdragomir

<script type="text/javascript">
    (function () {
      "use strict";
      // once cached, the css file is stored on the client forever unless
      // the URL below is changed. Any change will invalidate the cache
      var css_href = './index_files/web-fonts.css';
      // a simple event handler wrapper
      function on(el, ev, callback) {
        if (el.addEventListener) {
          el.addEventListener(ev, callback, false);

dweinstein

# ...
ADD package.json /tmp/package.json
RUN cd /tmp && npm install && \
    mkdir -p /opt/app && cp -a /tmp/node_modules /opt/app/

# ...
WORKDIR /opt/app
ADD . /opt/app

julianshapiro

var IE = (function() { 
        if (document.documentMode) {
            return document.documentMode;
        } else {
            for (var i = 7; i > 4; i--) {
                var div = document.createElement("div");

                div.innerHTML = "<!--[if IE " + i + "]><span></span><![endif]-->";

                if (div.getElementsByTagName("span").length) {

darryn

  {% if template contains 'collection' and collection.all_tags.size > 1 %}
  
  <!-- A recursive loop to catch and filter out the different tag categories -->
  {% assign c = 0 %} 
  {% for t in collection.all_tags %}
  {% capture cat %}{{ cat }}{% capture temp_cat %}{% if t contains '_' %}{% assign cat_grp = t | split: '_' %}{{ cat_grp.first }}{% endif %}{% endcapture %}{% unless cat contains temp_cat %}{% if t contains '_' %}{% assign new_cat_grp = t | split: '_' %}{{ new_cat_grp.first }}{% endif %}{% unless forloop.last %}+{% endunless %}{% assign c = c | plus: 1 %}{% endunless %}{% endcapture %}
  {% endfor %}
  
  <!-- create array of tag categories -->
  {% assign cat_array = cat | split: '+' %}