Sticky keys allow you to press keys in sequential order instead of all together to activate commands.
Chromebook
Open ChromeOS Settings,
Scroll to Accessibility.
Select Enable sticky keys (to perform keyboard shortcuts by typing them sequentially).
OR
Press Alt+Shift+S,
Scroll to Accessibility.
Select Enable sticky keys (to perform keyboard shortcuts by typing them sequentially).
See: Sticky keys | Chromebook Mobility-Assistive Features and Functionality [YouTube]
Mac
Option + Command + F5,
OR
Triple-click on the Touch ID button,
Then:
Scroll down to Motor section,
And toggle the radio button next to Sticky Keys.
You can control more settings in Sticky keys on Macs by
selecting Settings at the bottom of the dialog box.
Then, scroll to Keyboard,
Find and select Sticky keys,
Click the info button to the right of the toggle.
Useful settings may be:
Press the Shift key five times to toggle Sticky keys;
Beep when a modifier key is set;
Display pressed keys on screen;
and setting the Screen area for display.
See: Change Keyboard settings for accessibility on Mac | Apple Support
Linux
Open the Activities overview
and start typing Accessibility.
Click Accessibility to open the panel.
Select the Typing section to open it.
Find the Typing Assist section,
switch the Sticky Keys switch to on.
See: Turn on sticky keys | Ubuntu documentation
Windows
Press Shift 5 times.