title: How to hide highChart plotLine label until mouseover?
body: <p><a href="http://jsfiddle.net/leongaban/n36y336z/" rel="nofollow noreferrer">http://jsfiddle.net/leongaban/n36y336z/</a></p>
  
  <p><a href="https://i.stack.imgur.com/y0CiH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/y0CiH.png" alt="enter image description here"></a></p>
  
  <p>I have a plotline series on my highChart which has a label. What I'm trying to do is hide the label until mouseover. Has anyone attempted this before?</p>
  
  <pre><code>$(function() {
    var $report = $('#report');
  
    $('#container').highcharts({
      xAxis: {
        plotLines: [{ // mark the weekend
          color : 'rgba(254,235,236,0.5)',
          from  : Date.UTC(2010, 0, 2),
          to    : Date.UTC(2010, 0, 3),
          zIndex: 1,
          label: {
            text    : 'Event',
            align   : 'left',
            style   : { color: '#000' },
            visible : false
          },
          events: {
            click: function(e) {
                console.log('clicked event')
            },
            mouseover: function(e) {
                console.log('show plotline label')
            },
            mouseout: function(e) {
                console.log('hide plotline label')
            }
          }
        }],
        tickInterval: 24 * 3600 * 1000,
        type: 'datetime'
      },
  
      series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4],
        pointStart: Date.UTC(2010, 0, 1),
        pointInterval: 24 * 3600 * 1000
      }]
    });
  });
  </code></pre>