title: Chart js not display graph
body: <p>I use chart js to display my graph, but it wont displaying it...
  I try to check it in jsfiddle and it works there, but on my website it actually wont work. 
  The source from chart.js is correctly embedded, so i don't know what the error could be</p>
  
  <p><a href="https://jsfiddle.net/heocfLks" rel="nofollow noreferrer">jsfiddle Link</a></p>
  
  <p>My code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var diemeltalsperrectx = document.getElementById('diemeltalsperre').getContext('2d');
  var diemeltalsperre = new Chart(diemeltalsperrectx, {
    type: 'line',
    data: {
      labels: [
        '08.05.2020 - 18:15:00',
        '09.05.2020 - 01:00:00',
        '09.05.2020 - 06:15:00',
        '09.05.2020 - 18:15:00',
        '10.05.2020 - 01:00:00',
        '10.05.2020 - 06:15:00',
      ],
      datasets: [{
        fill: true,
        label: 'Pegelstand (cm)',
        data: [
          374.91,
          374.9,
          374.9,
          374.87,
          374.87,
          374.84,
        ],
        backgroundColor: [
          'rgba(0,0,128, 1)'
        ],
        borderColor: [
          'rgba(0,0,128, 1)'
        ],
        borderWidth: 3
      }]
    },
    options: {
      scales: {
        yAxes: [{
          ticks: {
            beginAtZero: true
          }
        }]
      }
    }
  });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.js"&gt;&lt;/script&gt;
  &lt;canvas id='diemeltalsperre' width='800' height='400'&gt;&lt;/canvas&gt;</code></pre>
  </div>
  </div>
  </p>