W3Schools Tryit 编辑器 - W3Schools 中文教程

<html>
<head>
<style>
#colorText {
  font-family: monospace;
  font-size: 25px;
}

::highlight(mycolor-1) {
  color: red;
}
::highlight(mycolor-2) {
  color: green;
}
::highlight(mycolor-3) {
  color: blue;
}
::highlight(mycolor-4) {
  color: salmon;
}
</style>
</head>
<body>

<h1>Demo of ::highlight</h1>

<p id="colorText">CSS Custom Highlight</p>

if (!CSS.highlights) {
  textNode.textContent =
    "Highlight API is not supported!";
}

// Create and register highlights for each color
const highlights = [];
for (let i = 0; i < 4; i++) {
  // Create a new highlight for this color.
  const colorHighlight = new Highlight();
  highlights.push(colorHighlight);

// Register this highlight under a custom name.
  CSS.highlights.set(`mycolor-${i + 1}`, colorHighlight);
}

// Iterate over the text, character by character.
for (let i = 0; i < textNode.textContent.length; i++) {
  // Create a new range just for this character.
  const range = new Range();
  range.setStart(textNode, i);
  range.setEnd(textNode, i + 1);

// Add the range to the next available highlight,
  // looping back to the first one when reached the 4th.
  highlights[i % 4].add(range);
}
</script>
</body>
</html>