Mindmap Tool
https://tools.quality.de/mindmap_tool.html
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Adding a single host
ALLOWED_IFRAME_SOURCES="https://tools.quality.de/mindmap_tool.html"example.com"
Multiple hosts can be separated with a space
ALLOWED_IFRAME_SOURCES="https://tools.quality.de/mindmap_tool.html"a.example.com https://b.example.com"
Allow all sources
This opens vulnerability risk and should only be done in secure & trusted environments.
ALLOWED_IFRAME_SOURCES="*"