The words interfaces are made of.

A held key firing repeatedly after an initial delay, which is how arrow keys scroll and backspace deletes more than one character.

A browsing layout of side-by-side columns where selecting an item in one column fills the next with its children, keeping the whole path visible.

The band at the top of a screen carrying the page title, its context, and the actions that apply to the page as a whole.

How comfortably a body of text can be read at length, a property of the setting: size, measure, leading, and contrast.

The system panel of destinations and actions for sending the current item elsewhere, populated by whatever apps are installed.

The colour of a plane that content sits on, defined as a set of stacked levels so a card on a page and a sheet on a card are told apart by value.

Warning the reader that edits will be lost before a navigation or close is allowed to proceed, and offering to save or discard first.

A perceptual contrast algorithm proposed for WCAG 3 that scores a text and background pair as an Lc value and takes font size and weight into account.

A shortcut whose keys are held down together like a chord, in contrast to one typed as a sequence of separate presses.

Tufte's measure of chart economy: the share of ink that would be missed if erased, with everything else a candidate for deletion.

A tool that turns the cursor into a sampler so a colour can be picked from anywhere on screen, usually with a magnified preview of the pixel under it.

Blurring a group of shapes and then crushing the blur back to a hard edge so overlapping elements merge into one liquid silhouette as they move apart and together.