IntelliJ Platform UI Guidelines
Controls
Button
Built-in button
Split button
Checkbox
Combo box
Description text
Drop-down list
Got It tooltip
Group header
Input field
Link
Notifications
Balloon
Banner
Progress indicators
Loader
Progress bar
Progress text
Radio button
Scrollbar
Search field
Table
Tabs
Text area
Toggle button
Toolbar
Icon button
Split icon button
Toolbar drop-down list
Context help
Inline help text
Tooltip
Empty state
Components
Tool window
Principles
Data formats
Icons
Layout
Groups of controls
Mnemonics
Platform theme colors
Typography
Validation errors
Text
Capitalization
Inspections
Punctuation
Writing short and clear
Resources
UI kit
How to write guidelines
Icons list