Pixel Perfect
Adjective · Slang & Abbreviations
Definitions
Matching a design spec at a very fine visual level, down to spacing, alignment, and individual rendered pixels. The phrase is common in frontend and design handoff work, sometimes admiringly and sometimes sarcastically.
In plain English: Matching the design extremely precisely at the visual level.
Example: "The layout is close, but it's not pixel perfect on the tablet breakpoint yet."