Use TAB key to reach infotip button, then use ENTER or SPACEBAR to expand content.
Please read the documentation to understand how these examples were created.
Example 1: Button
Example 2: Enhanced Anchor/Footnote
Gregor Samsa appears to be based upon Kafka himself. As when Kafka suffered from insomnia, he feared he was repulsive and a burden to his family, during which time his sister was his caretaker.