因為要demo, 卻發現selenium無法顯示滑鼠指標.
goole找一下, 找到以下的方法.

Ref: Visualize / Show mouse cursor position in selenium 2 tests

    const mouse = document.createElement('img');
    mouse.setAttribute(
      'src',
      'data:image/png;base64,' +
        'iVBORw0KGgoAAAANSUhEUgAAABQAAAAeCAQAAACGG/bgAAAAAmJLR0QA/4ePzL8AAAAJcEhZcwAA' +
        'HsYAAB7GAZEt8iwAAAAHdElNRQfgAwgMIwdxU/i7AAABZklEQVQ4y43TsU4UURSH8W+XmYwkS2I0' +
        '9CRKpKGhsvIJjG9giQmliHFZlkUIGnEF7KTiCagpsYHWhoTQaiUUxLixYZb5KAAZZhbunu7O/PKf' +
        'e+fcA+/pqwb4DuximEqXhT4iI8dMpBWEsWsuGYdpZFttiLSSgTvhZ1W/SvfO1CvYdV1kPghV68a3' +
        '0zzUWZH5pBqEui7dnqlFmLoq0gxC1XfGZdoLal2kea8ahLoqKXNAJQBT2yJzwUTVt0bS6ANqy1ga' +
        'VCEq/oVTtjji4hQVhhnlYBH4WIJV9vlkXLm+10R8oJb79Jl1j9UdazJRGpkrmNkSF9SOz2T71s7M' +
        'SIfD2lmmfjGSRz3hK8l4w1P+bah/HJLN0sys2JSMZQB+jKo6KSc8vLlLn5ikzF4268Wg2+pPOWW6' +
        'ONcpr3PrXy9VfS473M/D7H+TLmrqsXtOGctvxvMv2oVNP+Av0uHbzbxyJaywyUjx8TlnPY2YxqkD' +
        'dAAAAABJRU5ErkJggg=='
    );
    mouse.setAttribute('id', 'selenium-mouse');
    mouse.setAttribute(
      'style',
      'position: absolute; z-index: 999999; pointer-events: none; left:0; top:0'
    );
    document.body.appendChild(mouse);
    document.onmousemove = function(e) {
      document.getElementById('selenium-mouse').style.left = e.pageX + 'px';
      document.getElementById('selenium-mouse').style.top = e.pageY + 'px';
    };

PS: 後來找到 selenium 可以用  execute_script 把上面滑鼠的javascript灌進browser裡.