Article page causes 100% CPU after network loss, tab switch, and sleep on macOS

[dreamthreebs]

When I open a specific article inside a GitBook space in Chrome on my MacBook Pro (M4), then perform the following sequence:

1. Switch to another browser tab (GitBook tab is in background)
2. Disconnect from the internet (e.g. turn off Wi-Fi)
3. Let the Mac enter full sleep with screen turned off (e.g. close the lid or let it go black)

Upon waking the machine, the GitBook article tab starts consuming 100% CPU (1 full core). This high CPU usage persists until the GitBook article tab is closed.

This issue only occurs when:

• A GitBook article page is opened (not the space home or GitBook.com homepage)
• The Mac enters true screen-off sleep
• The tab is left in the background during sleep + offline

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Steps to reproduce:

1. Open Chrome on macOS
2. Navigate to a GitBook space and click into a specific article page
3. Switch to another tab (GitBook tab now in background)
4. Disconnect from the network
5. Let the screen sleep completely (black screen or lid closed)
6. Wake up and reconnect
7. Observe GitBook tab consumes 100% CPU

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Impact:
This causes overheating and battery drain even when the device appears idle. It seems to be related to GitBook's frontend handling of offline + background + sleep transitions on article pages.

Please investigate, thank you!