%X_UA_COMPATIBLE% displayed in the runner web page in debug mode

[sroucheray]

🐞 Bug report

Command

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• extract-i18n
• run
• config
• help
• version
• doc

Is this a regression?

Yes

Description

The runner web page in debug mode displays an %X_UA_COMPATIBLE% text.

🔬 Minimal Reproduction

# install the cli
npm install -g @angular/cli
# create a new project
ng new my-app
cd my-app
# launch the tests
ng test
# then open the debug page

🌍 Your Environment

Angular CLI: 12.2.9
Node: 14.18.0
Package Manager: yarn 1.22.15
OS: linux x64

Angular: 12.2.9
... animations, cdk, cli, common, compiler, compiler-cli, core
... elements, forms, language-service, localize
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1202.11
@angular-devkit/build-angular   12.2.9
@angular-devkit/core            12.2.9
@angular-devkit/schematics      12.2.9
@schematics/angular             12.2.9
ng-packagr                      12.2.4
rxjs                            6.5.5
typescript                      4.3.5
webpack                         5.59.1

Anything else relevant?

I originally posted an issue on Karma's github issue tracker but while digging for this problem I realized this repo hold a duplicate of the Karma debug page so maybe the issue is here.
https://github.com/angular/angular-cli/blob/master/packages/angular_devkit/build_angular/src/webpack/plugins/karma/karma-debug.html

[alan-agius4]

Fixed upstream via karma-runner/karma#3718

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}