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<picture>
    <source media="(min-width: 1200px)"
        srcset="https://res.cloudinary.com/demo/image/upload/c_scale,w_900,dpr_auto,f_auto/sample.jpg">
    <source media="(min-width: 900px)"
        srcset="https://res.cloudinary.com/demo/image/upload/c_scale,w_600,dpr_auto,f_auto/sample.jpg">
    <img src="https://res.cloudinary.com/demo/image/upload/c_scale,w_300,dpr_auto,f_auto/sample.jpg">
</picture>

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const options = {
  root: null, // use null for viewport
  rootMargin: '0px',
  threshold: 1.0
};
const observer = new IntersectionObserver(callback, options);
const target = document.querySelector('#someSection');

observer.observe(target);

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[
  {
    "id": 1009189,
    "name": "Black Widow",
    "description": "",
    "thumbnail": {
      "path": "http://i.annihil.us/u/prod/marvel/i/mg/f/30/50fecad1f395b",
      "extension": "jpg"
    },
    "resourceURI": "http://gateway.marvel.com/v1/public/characters/1009189",

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{
  id
  name
  description
  thumbnail
  resourceURI
}

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[
  {
    "id": 1009189,
    "name": "Black Widow",
    "description": "",
    "modified": "2016-01-04T18:09:26-0500",
    "thumbnail": {
      "path": "http://i.annihil.us/u/prod/marvel/i/mg/f/30/50fecad1f395b",
      "extension": "jpg"
    },

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/***********************************
This is the Adafruit GPS library - the ultimate GPS library
for the ultimate GPS module!

Tested and works great with the Adafruit Ultimate GPS module
using MTK33x9 chipset
    ------> http://www.adafruit.com/products/746
Pick one up today at the Adafruit electronics shop 
and help support open source hardware & software! -ada

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/***********************************
This is our GPS library

Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, check license.txt for more information
All text above must be included in any redistribution

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// This #include statement was automatically added by the Spark IDE.
#include "Adafruit_GPS.h"
#include <math.h>

#define mySerial Serial1
Adafruit_GPS GPS(&mySerial);
  
   

// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console

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// Global Vars

$basefontsize: 16 !default;

// Mixins

// input pixel value unitless: 8 vs 8px
// ex. @include rem(padding, 8 12 16 24)

@mixin rem($property, $px: $basefontsize) {

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<div class="container">

<header>
<code>
  .mod--foo {
    @include column-span(6, 3);
  } 
  <br>// $column-count, $offset[optional]
  <br>// To do: properly clear first in row
</code>