note/example/highlight.html at master · Packedcat/note · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Highlight API</title>
  </head>

  <style>
    :root {
      background-color: #546E7A;
      font-size: larger;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
      padding: 1em;
    }
    ::highlight(s-keyword) {
      color: #ffd740;
    }
    ::highlight(s-variables) {
      color: white;
    }
    ::highlight(s-value) {
      color: #FF8A80;
    }
    ::highlight(s-operator) {
      color: #40C4FF;
    }
  </style>
  </style>
  <body>
    <div id="answer">const answer = 42</div>
    <script>
      const container = document.getElementById("answer").childNodes[0];
      const rangeKeyword = new StaticRange({
        startContainer: container,
        startOffset: 0,
        endContainer: container,
        endOffset: 5,
      });
      const rangeVariables = new StaticRange({
        startContainer: container,
        startOffset: 6,
        endContainer: container,
        endOffset: 12,
      });
      const rangeOperator = new StaticRange({
        startContainer: container,
        startOffset: 13,
        endContainer: container,
        endOffset: 14,
      });
      const rangeValue = new StaticRange({
        startContainer: container,
        startOffset: 15,
        endContainer: container,
        endOffset: 17,
      });
      CSS.highlights.set("s-keyword", new Highlight(rangeKeyword));
      CSS.highlights.set("s-variables", new Highlight(rangeVariables));
      CSS.highlights.set("s-operator", new Highlight(rangeOperator));
      CSS.highlights.set("s-value", new Highlight(rangeValue));
    </script>
  </body>
</html>