data-height attribute takes the width of the rendered player. Values can be provided with either pixel units (px) or percentages (%). If no unit is provided, pixels are assumed. The default value is 100%. We recommend using 16:9 ratios. For example, 480x270, 640x360, 853x480 are all (width)x(height) dimensions using the 16:9 aspect ratio. Please note that, if your site uses a responsive page design, you will probably want to leave your width and height at the default 100% so that the player will automatically shrink with your page on small screens like phones and tablets.