About Pym.js Latest version: 1.3.2 (released Feb. 13, 2018) Using iframes in a responsive page can be frustrating. It’s easy enough to make an iframe’s width span 100% of its container, but sizing its height is tricky — especially if the content of the iframe changes height depending on page width (for example, because of text wrapping or media queries) or events within the iframe. Pym.js embeds a