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Pym.js Embeds
v2.0.0 · by Automattic
A WordPress block and shortcode for embedding iframes that are responsive horizontally and vertically, using the NPR Visuals Team's Pym.js.
About this plugin
Pym.js Embeds provides shortcode and Gutenberg block wrappers for embedding responsive iframes using Pym.js, developed by the NPR Visuals Team. Embedded content resizes vertically to match its container’s width.
AMP compatibility is provided by the official AMP plugin.
Pym.js Resources from NPR
You may also want to look at NPR’s Pym.js resources: