Deprecates the GPUAdapter isFallbackAdapter boolean attribute from WebGPU, which is redundant with the GPUAdapterInfo isFallbackAdapter boolean attribute. This upcoming removal is a minor breaking change as support for fallback adapters has not yet been implemented in any browser, thereby resulting in both isFallbackAdapter attributes consistently returning a falsy value.
Removing GPUAdapter isFallbackAdapter boolean attribute eliminates unnecessary complexity and potential confusion by consolidating the functionality within the existing GPUAdapterInfo isFallbackAdapter boolean attribute. This change promotes cleaner code and a more intuitive development experience. A search for the string "isFallbackAdapter" in HTTPArchive yielded no results. As of Apr 30, 2025, usage of the GPUAdapter isFallbackAdapter boolean attribute reached a peak of 0.000338% of page loads according to the ChromeStatus dashboard https://chromestatus.com/metrics/feature/timeline/popularity/5460.