I just experienced and issue where the height of the container of an HTML5 video (1080px, mp4) was calculated wrong. The respective stylesheet had set video width to 100% and no height (defaults to height:auto). The browser rendered the video container to a height of >6000px while maintaining the width of the surrounding div and the actual aspect-ratio of the video. Really strange behaviour. The issue seems to occur in Chrome 64 and Opera 51. Firefox and Edge are not affected by the issue.
2018-03-15 @ 14:00: Chromium based browsers seem to calculate the height of HTML5 videos wrong