chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/active-selection-001-manual.html

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Pseudo-Elements Test: active selection and color (basic)</title>

  <link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#highlight-selectors">
  <link rel="help" href="https://www.w3.org/TR/css-pseudo-4/#highlight-styling">

  <meta content="interact" name="flags">

  <style>
  div
    {
      color: red;
      font-size: 300%;
    }

  div::selection
    {
      color: green;
    }
  </style>

  <p>Instructions: Select a few or all characters from the words "Text sample" using a variety of methods:

  <ul>
    <li>Select by dragging (leftwardedly or rightwardedly) the mouse across the characters.
    <li>Select by using shift + keyboard arrows when keyboard navigation / caret browsing is enabled.
    <li>Double click a word to select it.
    <li>Triple click the text to select it.
  </ul>

  <p>Test passes if, in every case, the selected characters become green <em>and</em> if there is no background color for the characters selection.

  <div>Text sample</div>