Problem report: https://runestone.academy/ns/course/index

A problem was reported through the Runestone "Report a Problem" form.

Description

Text editors display with white background, but in dark mode, the text is white as well. This prevents the user from viewing the text as they type.

Browser console log

[log] Runestone component activecode is being queued for import
[warn] No ad placements found.
[log] Timezone cookie matches, not sending timezone to server
[log] This page served by undefined
[log] setup navbar for logged out
[log] triggering runestone:pre-login-complete
[log] Runestone pre-login complete
[log] adding video popouts
[log] setting up pretext
[log] Webpack is starting the loading process for the following Runestone modules ["activecode"]
[log] Runestone component activecode has been loaded
[log] before get hist
[log] making a new scrubber
[log] SpliceWrapper: received message subject: undefined from iframe: unknown
[log] focus on [object HTMLButtonElement]
[log] focus on [object HTMLButtonElement]
[log] focus on [object HTMLButtonElement]
[uncaught] ReferenceError: knowl_focus_stack is not defined @ https://runestone.academy/ns/books/published/SJPCSA_2026/_static/pretext/js/dist/pretext-core.js?v=2.48:1370

Reproduce the issue at https://runestone.academy/ns/course/index with dark mode enabled, focusing on the text editor behavior described in the report. Start by inspecting the loaded pretext/js/dist/pretext-core.js file and the activecode component path shown in the console log. Done means editor text remains readable while typing in dark mode, while light mode still works.