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Web-vitals metrics

Official Docs -

LCP - https://web.dev/articles/lcp

FID - https://web.dev/articles/fid

CLS - https://web.dev/articles/cls

INP - https://web.dev/articles/inp

TTFB - https://web.dev/articles/ttfb

FCP - https://web.dev/articles/fcp

Minimum versions in platform browser combination for LCP support

Chrome Edge FireFox Safari
Web-vital support 77 79 122 NO_SUPPORT
SauceLab Config OS X 10.10 - chrome 78 OS X 10.10 - microsoftEdge 80 NO_SUPPORT - SauceLabs NO_SUPPORT - webVital
macOS 10.12 - chrome 78 macOS 10.12 - microsoftEdge 80 macOS 10.15 - fireFox 124 NO_SUPPORT - webVital
windows 7 - chrome 78 windows 10 - microsoftEdge 80 windows 10 - fireFox 122 NO_SUPPORT - webVital

Minimum versions in platform browser combination for FID support

Deprecated and will be removed in next major release

Chrome Edge FireFox Safari
Web-vital support 76 79 89 NO_SUPPORT
SauceLab Config OS X 10.10 - chrome 77 OS X 10.10 - microsoftEdge 80 NO_SUPPORT - SauceLabs NO_SUPPORT - webVital
macOS 10.12 - chrome 77 macOS 10.12 - microsoftEdge 80 macOS 10.12 - fireFox 90 NO_SUPPORT - webVital
windows 7 - chrome 77 windows 10 - microsoftEdge 80 windows 7 - fireFox 90 NO_SUPPORT - webVital

Minimum versions in platform browser combination for CLS support

Chrome Edge FireFox Safari
Web-vital support 77 79 NO_SUPPORT NO_SUPPORT
SauceLab Config OS X 10.10 - chrome 78 OS X 10.10 - microsoftEdge 80 NO_SUPPORT - webVital NO_SUPPORT - webVital
macOS 10.12 - chrome 78 macOS 10.12 - microsoftEdge 80 NO_SUPPORT - webVital NO_SUPPORT - webVital
windows 7 - chrome 78 windows 10 - microsoftEdge 80 NO_SUPPORT - webVital NO_SUPPORT - webVital

Minimum versions in platform browser combination for INP support

Chrome Edge FireFox Safari
Web-vital support 96 96 NO_SUPPORT NO_SUPPORT
SauceLab Config OS X 10.11 - chrome 97 NO_SUPPORT - SauceLabs NO_SUPPORT - webVital NO_SUPPORT - webVital
macOS 10.12 - chrome 97 macOS 10.12 - microsoftEdge 97 NO_SUPPORT - webVital NO_SUPPORT - webVital
windows 7 - chrome 97 windows 10 - microsoftEdge 97 NO_SUPPORT - webVital NO_SUPPORT - webVital

Minimum versions in platform browser combination for TTFB support

Chrome Edge FireFox Safari
Web-vital support 43 12 35 11
SauceLab Config OS X 10.10 - chrome 44 OS X 10.10 - MicrosoftEdge 79 OS X 10.10 - firefox 35 NO_SUPPORT - SauceLabs
macOS 10.12 - chrome 44 macOS 10.12 - MicrosoftEdge 13 macOS 10.12 - firefox 35 macOS 10.12 - safari 11
windows 7 - chrome 67 windows 10 - MicrosoftEdge 13 windows 7 - firefox 35 NO_SUPPORT - SauceLabs

Minimum versions in platform browser combination for FCP support

FCP metrix is inconsistent

Chrome Edge FireFox Safari
Web-vital support 60 79 84 14.1
SauceLab Config OS X 10.10- chrome 84 OS X 10.10- MicrosoftEdge 79 NO_SUPPORT - SauceLabs NO_SUPPORT - SauceLabs
macOS 10.12 - chrome 60 macOS 10.12 - MicrosoftEdge 79 macOS 10.12 - firefox 84 macOS 12 - safari 15
windows 7 - chrome 74 windows 10 - MicrosoftEdge 92 windows 7 - firefox 85 NO_SUPPORT - SauceLabs

Web Vitals Testing Results Across Multiple Browsers and Platforms Using Sauce Labs

Chrome Edge FireFox Safari
LCP 77 OSX10.10, MACOS10.12, WIN 7 79 OSX10.10, MACOS10.12, WIN 10 122 --
FID 76 OSX10.10, MACOS10.12, WIN 7 79 OSX10.10, MACOS10.12, WIN 10 89 MACOS10.12, WIN 7 --
CLS 77 OSX10.10, MACOS10.12, WIN 7 79 OSX10.10, MACOS10.12, WIN 10 -- --
INP 96 OSX10.11, MACOS10.12, WIN 7 96 MACOS10.12, WIN 10 -- --
TTFB 43 OSX10.10, MACOS10.12, WIN 7 12 OSX10.10 - Edge 79, MACOS10.12 - Edge 13, WIN 10 - Edge 13 35 OSX10.10, MACOS10.12, WIN 7 11 MACOS10.12
FCP 60 OSX10.10, MACOS10.12, WIN 7 79 OSX10.10, MACOS10.12, WIN 10 84 MACOS10.12, WIN 7 14.1 MACOS12

Reference -

Saucelabs platform-configurator - https://saucelabs.com/products/platform-configurator

PerformanceEventTiming - https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEventTiming/interactionId

INP for non-supporting browsers - GoogleChrome/web-vitals#367 FID for non-supporting browsers - GoogleChrome/web-vitals#368