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Box model
The rule that every HTML element is a rectangle made of four layers: the content, then padding around it, then a border, then margin outside that.
Core loop
The short sequence of actions a player repeats over and over in a game, such as aim, shoot, collect, upgrade, then aim again.
Frame rate
The number of still images shown per second in an animation or video, measured in frames per second, such as 24 fps for film or 60 fps for smooth screen motion.
Keyframe
A frame where you set a value such as position, size or colour, so the software can calculate the frames between one keyframe and the next.
Media query
A CSS rule that applies a block of styles only when the screen matches a condition, most often a minimum or maximum width.
Resolution
How many pixels an image contains, given either as pixel dimensions such as 1920 by 1080, or as pixel density in pixels per inch when the image is printed.
Semantic HTML
Writing HTML with tags that describe what the content means, such as nav for navigation or article for a standalone piece, rather than using div for everything.