Community / informal

Per-format specification (collected references)

Catch-all bucket for image-format and media-format specifications maintained across multiple bodies (W3C, Alliance for Open Media, JPEG, etc.). MDN's reference is the practical entry point.

Short name: Per-format spec
Scope: Community / informal
Homepage: developer.mozilla.org
Standards governed: 1

Standards governed by Per-format spec

Modern image formats (WebP / AVIF) MDN reference global Performance WebP saves ~25–35% vs JPEG; AVIF saves ~50%. Either is supported by every browser that matters in 2026. Serving JPEG/PNG by default in 2026 is a self-inflicted byte tax.