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#
# Wide-open CORS config for nginx
#
location / {

     if ($request_method = 'OPTIONS') {

        add_header 'Access-Control-Allow-Origin' '*';
        
        #

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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()

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Client-side SSL

For excessively paranoid client authentication.

Using self-signed certificate.

Create a Certificate Authority root (which represents this server)

Organization & Common Name: Some human identifier for this server CA.

openssl genrsa -des3 -out ca.key 4096
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

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SELECT 
  -- Assumed to be trimmed
  name
  
  -- Does name contain multiple words?
  ,(LOCATE(' ', name) = 0) AS hasMultipleWords

  -- Returns the end of the string back until reaches a space. 
  --   E.g. "John Doe" => "Doe"
  --   E.g. "Francis Scott Key" => "Key"

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@mixin valid-quantity($quantity) {
  @if type-of($quantity) != 'number' {
    @error 'The "quantity" parameter must be a number!';
  }
  @if not(unitless($quantity)) {
    @error 'The "quantity" parameter must not have a unit!';
  }
  @if $quantity < 0 {
    @error 'The "quantity" parameter must be at least 0!';
  }

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KEYBINDINGS
       byobu keybindings can be user defined in /usr/share/byobu/keybindings/ (or within .screenrc if byobu-export was used). The  common  key  bindings
       are:

       F2 - Create a new window

       F3 - Move to previous window

       F4 - Move to next window

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[
  {
	"USD" : {
	  "symbol" : "$",
	  "name" : "US Dollar",
	  "symbol_native" : "$",
	  "decimal_digits" : 2,
	  "rounding" : 0,
	  "code" : "USD",
	  "name_plural" : "US dollars"

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Vue: Pass Slots through from Parent to Child Components

The Situation

• We've got some components A, B and C which provide different slots.

  const A = {
    template: `<div><slot name="a">Default A Content</slot></div>`
  }

const B = {

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Adding PIXEL/GUI to Raspbian Lite

These 'notes' were primarily intended for my own consumption but since there have been surprisingly many comments to it over the years I wanted to do some updates and clarifications. Thanks for all comments.

These instructions will require you to have connection to internet from your pi, WiFi, Ethernet or by some other means like a 3G USB dongle or something.

Preparations

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#!/bin/bash
# 
# Modify by k4ng
#
# ilia/php_excel extension example install script
# 
# usage: 
#   > sudo ./install_phpexcel_php5.6.sh
#   > (optionally) sudo service php5.6-fpm restart
#