Web Components: Just in the Nick of Time
summary
Started-from-scratch rewrites cut Gmail’s DOM by 40% DOM reduction in a prototype and about 30% in production, which yields a real-world half-second latency win for many users. The team replaces nine‑grid GIF hacks and custom JS layout with CSS rounded corners and Flexbox, prototypes ES.next features and Custom Elements, and ships Polymer upgrades—Shop drops ~340k to ~280k of resources and reaches Time to Interactive on a Moto G4 3G in roughly five seconds.
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