EmmET

Emmet is an open-source toolkit for web developers that speeds up HTML, CSS, and template editing by expanding short abbreviations into full code blocks. Users write an abbreviation using a compact syntax, then activate an expansion to generate markup or stylesheet fragments. The syntax supports element creation, nesting, multiplication, and attribute insertion, using operators such as > for nesting, + for siblings, * for repetition, and {text} for content. For example, div.container>ul#list>li*3>a{Link $} expands to a nested structure of a div containing a list with three items each containing a link.

Emmet originated as Zen Coding, created by Sergey Chikuyonok in the late 2000s, and was later renamed Emmet to reflect its broader scope across editors and languages. It has since been integrated into many development environments, including popular IDEs and text editors such as Visual Studio Code, Sublime Text, JetBrains products, Atom, and Vim, through official plugins or built-in support. In addition to HTML and CSS, Emmet supports templates and abbreviations for XML, JSX, and other markup-friendly syntaxes, often with editor-specific extensions to enhance compatibility and syntax highlighting.

While Emmet enables rapid code generation, it is not a full templating engine. It relies on the editor's expansion feature and may require configuration for snippets or custom abbreviations. Users customize or extend abbreviations through snippets, enabling project-specific templates.