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core-js vs lazysizes: who uses which

core-js is on more sites: 2,697,064 against 932,496 for lazysizes, about 2.9 times as many. Here's how they compare across the websites we've indexed, and where each one does best.

Where each one is used

Domaincore-jslazysizes
.com on .com1,737,564472,701
.org on .org168,33325,003
.uk in the UK119,62222,214
.de in Germany66,75150,865
.net on .net65,39222,755
.au in Australia50,70715,011
.br in Brazil40,58117,054
.ca in Canada45,7099,182

553 sites run both at once.

Questions

Which is more popular, core-js or lazysizes?

core-js is on more sites: 2,697,064 against 932,496 for lazysizes, about 2.9 times as many, across the sites StackGrep has indexed.

Do sites use core-js and lazysizes together?

553 sites load both. That's often a switch in progress, or two teams picking different tools.

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