Unable to run WebNN suite via https://wpt.live/tools/runner/index.html - browser remains stuck on test manifest message

[adrastogi]

(Apologies if this isn't the right place to report this- please redirect me as necessary.)

I was trying to manually run some of the WebNN conformance tests via: https://wpt.live/tools/runner/index.html

My normal process to enter /webnn in the Run tests under path text box and check the Use regular expression and Show output boxes, and that would usually be enough to cause the Count of matching tests value to increment. I could generally then start running tests shortly thereafter.

What ends up happening now is that the browser remains stuck on this page:

My browser information is below:

Environment

Field	Value
Microsoft Edge	147.0.3912.98 (Official build) (64‑bit)
Revision	6cae4df1a4ff81734385754fe2295f5dc953ecab
Chromium Version	147.0.7727.138
Operating System	Windows 11 Version 26H1 (Build 28567.1000)
JavaScript Engine	V8 14.7.25.9
User Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/147.0.0.0
Command Line	"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --no-startup-window --win-session-start --flag-switches-begin --enable-features=WebMachineLearningNeuralNetwork,WebNNOnnxRuntime --flag-switches-end
Executable Path	C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe