<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="description" content="A progressive image element - Progressively enhance image placeholders once they are in the viewport.">
  <title>progressive-image custom element demo</title>

  <link rel="stylesheet" href="/src/progressive-image-element.css">
  <style>
    body {
      font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans