alekseykulikov

In this article, I would like to share three features of PageSpeed Insights (PSI), that is not easy to find in the official documentation. I discovered them while hacking on the Lighthouse plugin and integrating PSI to Treo.sh.

For a context, PSI is a simple yet powerful API by Google, that audits your page using Lighthouse and provides real-world users' data from Chrome UX Report (CrUX).

1. Audit many categories with one request

By default, PSI API returns only performance category. It's possible to pass ?category argument multiple times and get a report with many Lighthouse categories using one request (available categories: performance, accessibility, best-practices, seo, pwa).

curl -i "https://www.googleapis.com/pagespe

majido

javascript:(function(){
  var meter = `
  <label style="position:fixed; z-index:10000; top: 0; left: 50%; transform: translateX(-50%); background-color: pink; padding: 5px;">
  Main thread jank (0-500ms):  <input id="jankmeter" type="range" min=0 max=500 value=50>
  </label>
  `;

  const d = document.createElement('jank');
  d.innerHTML = meter;
  document.body.appendChild(d);

jkrems

Modules - History & Future

History

• Early work by Ihab Awad (Google) and Kris Kowal (FastSoft)
  • https://twitter.com/kriskowal/status/943547614158450688
  • Hermetic eval presentation: https://docs.google.com/presentation/d/1KlPxgocvzpTq44KTF4xZ6TnzGRsy628hP5he7bXVB3I/edit#slide=id.i0
• 2009-09: 2nd draft of module strawman, still very close to "closures as modules", export x = 42
  • https://esdiscuss.org/topic/hermetic-evaluation-modules-strawman
  • https://docs.google.com/document/u/1/pub?id=1hNv1SHh_v_6nD1QBd6pySUJ2U5roAELzW5cqD2tt_WM

paulirish

#!/bin/bash

# 2017-06 (paulirish): updated for latest sources
# and incorporated fixes from my comments here: https://gist.github.com/xiaom/8264691#gistcomment-1648455

# 2015-ish (zmil): this script does absolutely ZERO error checking.   however, it worked
# for me on a RHEL 6.3 machine on 2012-08-08.  clearly, the version numbers
# and/or URLs should be made variables.  cheers,  zmil...@cs.wisc.edu

set -x

bdd

#!/bin/bash

# FZF_DEFAULT_COMMAND utility for fzf
#
# Tries to use Watchman, Ripgrep (rg), The Silver Searcher (ag) in this order.
# ...or falls back the fzf's Unix default.
#
# TODO:
# - Use 'git ls-files -cmod' in Git repositories

diegoconcha

###Redux Egghead Video Notes###

####Introduction:#### Managing state in an application is critical, and is often done haphazardly. Redux provides a state container for JavaScript applications that will help your applications behave consistently.

Redux is an evolution of the ideas presented by Facebook's Flux, avoiding the complexity found in Flux by looking to how applications are built with the Elm language.

####1st principle of Redux:#### Everything that changes in your application including the data and ui options is contained in a single object called the state tree

maxogden

Video stabilization using VidStab and FFMPEG

Examples here use the default settings, see the VidStab readme on GitHub for more advanced instructions.

Here's an example video I made

Install ffmpeg with the vidstab plugin from homebrew

brew install ffmpeg --with-libvidstab

PaulKinlan

#! /bin/bash

mkdir -p ./backgrounds


function get_google_device_art {
  local device=$1
  # Get the Google Device backgrounds
  curl "https://developer.android.com/distribute/marketing-tools/device-art-resources/$1/port_back.png" > "./backgrounds/$1_port_back.png"
  curl "https://developer.android.com/distribute/marketing-tools/device-art-resources/$1/port_fore.png" > "./backgrounds/$1_port_fore.png"

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

MSEdge

interface AesGcmEncryptResult {
    readonly attribute ArrayBuffer ciphertext;
    readonly attribute ArrayBuffer tag;

};

interface BookmarkCollection {
    readonly attribute long length;

    any item(unsigned long index);