Many tools for manipulating video in the browser are appearing every day: Sequence, Scenery, Veed.io, Runway, etc. How do they work? What are the challenges of browser based editing? How will new APIs like WebCodecs, WebGPU change the landscape? What are the tradeoffs of rendering video in the DOM vs using <canvas/>? This talk will explore the challenges of how to manipulate video in the browser and the future of browser based editing.