i18n

Layout properties named by flow direction (inline start, block end) rather than by screen edge, so a layout mirrors itself in other writing modes.

Flipping a layout horizontally for right to left languages, moving navigation and progression to the other side while leaving some elements unmirrored.

Whose clock a time is shown on, the reader's or the event's, and saying which, because a time with no zone beside it is a meeting somebody is going to miss.

Text mixing a right-to-left script with left-to-right runs such as numbers or Latin words, where each run keeps its own direction.

Whether a character that can be either a symbol or an emoji renders as flat text or as a colour emoji, selected by a variation selector or by CSS.

Breaking a word across two lines at a syllable boundary so lines fill more evenly, marked with a hyphen at the break.

Small guide text set beside or above a run of base text, most often to give the pronunciation of East Asian characters.

An invisible character placed inside a word that marks where a hyphen may appear if the word has to break, and stays hidden otherwise.

The empty rectangle a font renders when it has no glyph for a character, named for the block of bean curd it resembles.

Setting lines to run top to bottom in columns rather than left to right, as traditional Chinese, Japanese, and Korean typography does.

Whether a long unbroken string is allowed to split mid-word rather than overflow its container, and where that split may happen.

An invisible character that takes no width and adds a legal break point, letting a long string wrap without showing a hyphen.

The declared language of a document or a passage inside it, which picks the voice, the pronunciation rules, and the hyphenation a reader gets.

A signed track alongside video, presented as an inset or a companion stream, for readers whose first language is a sign language rather than the written caption text.