kiln-app 0.1.0

Native desktop apps from real HTML, CSS and TypeScript, rendered without Chromium or a WebView
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<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Kiln observers</title>
    <style>
      body {
        margin: 0;
        padding: 24px;
        background: #0b1226;
        color: #f4e7d3;
        font-family: Helvetica, Arial, sans-serif;
      }
      h1 {
        margin: 0 0 20px;
        font-size: 13px;
        letter-spacing: 0.18em;
        text-transform: uppercase;
        color: #8fa0c4;
      }
      .card {
        width: 260px;
        height: 90px;
        margin-bottom: 16px;
        padding: 12px;
        border-radius: 10px;
        background: #131e3d;
        border: 1px solid #22315c;
        font-size: 13px;
      }
      .card.seen {
        border-color: #7fc3ac;
      }
      #trailing {
        position: absolute;
        top: 660px;
        left: 24px;
      }
      #offstage {
        position: absolute;
        top: 1200px;
        left: 24px;
      }
      output {
        display: block;
        margin-top: 8px;
        font-family: Menlo, monospace;
        font-size: 12px;
        color: #f5a93c;
      }
      footer {
        margin-top: 20px;
        font-family: Menlo, monospace;
        font-size: 12px;
        color: #6c7a9c;
      }
    </style>
  </head>
  <body>
    <h1>Observers</h1>

    <section class="card" id="onstage">fully in view<output></output></section>
    <section class="card" id="trailing">crosses the bottom edge<output></output></section>
    <section class="card" id="offstage">far below the fold<output></output></section>

    <footer id="mutations">mutations: 0</footer>

    <script>
      const cards = document.querySelectorAll(".card");

      const mutations = document.querySelector("#mutations");
      let counted = 0;
      new MutationObserver((records) => {
        counted += records.length;
        mutations.textContent = "mutations: " + counted;
      }).observe(document.querySelector("body"), {
        childList: true,
        attributes: true,
        characterData: true,
        subtree: true,
      });

      const watcher = new IntersectionObserver(
        (entries) => {
          for (const entry of entries) {
            entry.target.querySelector("output").textContent =
              (entry.isIntersecting ? "visible " : "hidden ") +
              entry.intersectionRatio.toFixed(2);
            if (entry.isIntersecting) entry.target.classList.add("seen");
          }
        },
        { threshold: [0, 0.5, 1] },
      );

      for (const card of cards) watcher.observe(card);
    </script>
  </body>
</html>