iOS 13 has a Data Saver mode. It would be great for web developers to take advantage of this via a JavaScript API so they could provide a lighter experience such as not auto-playing a video background, or loading low DPI images for example. Chrome already supports this for 'Lite Mode' in Chrome for Android (previously known as Data Saver mode). REF: https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/save-data/
+1