WebNN API - October 2025 update

[ibelem]

Summary

• Add WebNN MLTensor interface
• Add lost methods for WebNN interfaces
• Add new operations defined in WebNN spec
• Update operations implementation for Windows ML (Windows 11 24H2+)
• Address @caugner 's comments by using a single statement with notes grouped by OS

@anssiko @Elchi3 PTAL

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

[anssiko]

Much thanks @ibelem!

I did not review each line, but I expect this to match the latest implementation status we've published at: https://webmachinelearning.github.io/webnn-status/

I believe @ibelem has semi-automatic tooling in place or as work in progress to ensure we stay in sync. For the above-mentioned webnn-status page, we need to augment this BCD dataset due to the extra information contained in there, e.g. for frameworks that make use the WebNN API.

[ibelem]

@anssiko Yes, this pull request updated the data to align with the latest information available at https://webmachinelearning.github.io/webnn-status/

@Elchi3 @caugner

[Elchi3]

Thanks @ibelem! The rewrite to notes makes sense to me. Great work! I also only spot checked them.

What about adding the following features? (I see the OWD collector detects them in Chrome 142 beta with the #web-machine-learning-neural-network flag enabled):

• MLContext.createConstantTensor
• MLContext.lost
• MLGraphBuilder.gelu
• MLGraphBuilder.notEqual
• MLOperand.dataType
• MLOperand.shape
• MLTensor.constant
• MLTensor.dataType
• MLTensor.readable
• MLTensor.shape
• MLTensor.writable

If you would rather deal with these in a follow-up PR, then that's also fine with me.

[ibelem]

Thank you @Elchi3 , I will update the data you mentioned in following PR. :)

[Elchi3]

Merging then! Thank you! 👍