The State of Web Vitals

CSS rendering hints on Wix sites

will-change (68.8%), aspect-ratio (35.8%), scroll-driven animations (100.0%), CSS containment (14.3%), and content-visibility (13.3%) across 5,619 sites.

Field data PhoneDesktopAll Scope All sites October 2026 edition · Desktop field outcomes · Wix sites only
Wix Scoped to 5,623 sites out of 203,892 analyzed (cms) Compare with all sites →

35.8% of Wix sites use aspect-ratio CSS rendering hints, and 100% of those sites have a good INP, against 100% of all Wix sites.

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
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INP pass rate

Sites with aspect-ratio CSS rendering hints have a good INP most often: 100%, against 100% of all Wix sites. Sites with will-change CSS hints have it least often, at 100%.

SitesGood, needs improvement, poor INPMedian
All Wix sites728100%37ms
aspect-ratio 35.8%268100%43ms
CSS contain 14.3%111100%43ms
content-visibility 13.3%104100%44ms
Scroll-driven animations 100.0%727100%37ms
will-change 68.8%529100%39ms
GoodNeeds improvementPoorSites: with Chrome field data
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
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CSS rendering hints usage

Scroll-driven animation is the most used: 100.0% of Wix sites. Aspect-ratio is 35.8% of Wix sites.

Sites using each option (sites can use more than one) 5,619 sites
Scroll-driven animations 100.0% will-change 68.8% aspect-ratio 35.8%
Scroll-driven animations 100.0% will-change 68.8% aspect-ratio 35.8% CSS contain 14.3% content-visibility 13.3%
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
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CSS rendering hints per framework

On React, 100% of sites use scroll-driven animation CSS rendering hints, and 100% of React sites have a good INP, against 100% of all sites.

FrameworkCSS rendering hints on its sitesGood INP
Wix sites with CSS rendering hints 5,619 sitesScroll-driven animations 100%will-change 69%aspect-ratio 36%CSS contain 14%content-visibility 13%100%
React 5,619 sitesScroll-driven animations 100%will-change 69%aspect-ratio 36%CSS contain 14%content-visibility 13%100%
Scroll-driven animations will-change aspect-ratio CSS contain content-visibility
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
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CSS rendering hints or the framework

Does the framework explain the CSS rendering hints difference?

On React, 100% of sites with aspect-ratio CSS rendering hints have a good INP, against 100% of React sites with scroll-driven animation. Within React, sites with aspect-ratio and scroll-driven animation have a good INP about equally often.

How CSS rendering hints isolate layout and compositor work

CSS hints instruct the rendering engine how to allocate compositor layers and skip offscreen layout work. Among hint-using sites, 68.8% use will-change (100% good INP), 35.8% use aspect-ratio (100% good INP), 100.0% use scroll-driven animations (100% good INP), 14.3% use contain (100% good INP), and 13.3% use content-visibility (100% good INP).

The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
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Understanding CSS rendering hints

Use aspect-ratio to reserve responsive media boxes, scroll-driven animations to move scroll effects off the main thread, and content-visibility: auto with contain-intrinsic-size on long below-the-fold sections. Avoid applying will-change across large numbers of elements, which exhausts GPU memory.

Go fix it Fix excessive DOM size → HTML reflow and Core Web Vitals → INP: presentation delay →
The State of Web Vitals · October 2026 · Wix: 5,621 crawled sites · 728 with desktop field data · 5,619 sites with CSS rendering hintsBy Arjen Karel · corewebvitals.io/state-of-cwv
Related signals Scheduling API use → Interaction invoker types → Yielding strategy → INP phase breakdown → By Arjen Karel · 5,621 crawled Wix sites (728 with desktop Chrome field data, 5,619 sites with CSS rendering hints, October 2026) · How we measured