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What would the advantage of this be versus using the picture tag with your own image sources hosted on a CDN? (Let's assume picture tag is widely supported for now)

It is possible to easily target thr picture element using imgix's URL API directly. However, with picture you are limited to a set of image sizes and predefined dprs. This library allows the containing element to recieve an image at any size necessary with any DPR multiplier (up to 5, I believe) with the added bonus of conditional image manipulation overrides. In the example, we are baking in textual image information. Other edits like image quality and sharpening or midtone adjustments could be conditionally set as the image crops larger or smaller.

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