The measure of how easily light passes through a material. It is a quantitative characteristic that can be represented as a number within the range of [0, 1], and in some cases [0%,100%], with lower numbers indicating higher transparency.
A type of graphical interface that allows the user to interact with the application on a screen, such as a computer monitor or smartphone, using various types of input devices.
The placement or otherwise of a thing in relation to other things. In design, proximity may be considered as the distance between two items in space or their relative location to each other.
Colours on the opposite side of the colour wheel to warm colours. Typically bluish in tone, such as blue or green.
A selector that can be applied to any HTML element. Classes should be used when designing for multiple instances. For example, if you want all <h1> tags in the website to look blue, then you could use the class="blue-text" attribute.
An observation in Psychology that suggests that the number of mental objects the average person can keep track of is seven (plus or minus two).
The principle of both sides of an object having a sense of symmetry. It ensures that the weight and visual mass are distributed evenly on both sides of a surface. Balance is more important than symmetry because people don't often notice when something is asymmetrical, but they will always see if something is unbalanced.
A printing press that uses movable type and punches to make impressions on paper.
A unit for defining the size of a font. It's not a distance; this unit's measurement is only relative to the typeface's design.
A psychological phenomenon that states that people tend to remember unfinished or interrupted tasks better than completed tasks.
Text that flows from left to right and is the default reading direction of a page with its content aligned on the left margin.