In the last dev update of Google Chrome OS, you can allow the Search key to act as a Function key from chrome://flags.

Once you've done that, go to chrome://settings/keyboard-overlay and check "Use the Search key to access extended keybindings."

Finally, press <Ctrl> + <Alt> + <Shift> + ? to display keyboard shortcuts and see all new features such as "Delete", "Home", "End" (and "Insert" soon).

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