"new cell" below or above not rendered properly in Safari and duck duck go

[dxunix]

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Description

using safari and duckduckgo in macOS (15.0), the button or shortcut key to add a new cell above or below does not result a new cell being added/rendered.

Reproduce

click on "+" or esc + b or c, in safari or duckduckgo browser, nothing happens, sometimes even refresh does not reveal the new cell..

Expected behavior

Context

OS = macOS 15.0 on M1 Safari = Version 18.0 (20619.1.26.31.6) duckduckGo = Version 1.99.0 (234) python = 3.12 jupyter nb = Version: 7.2.2

Troubleshoot Output

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Command Line Output

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Browser Output

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