Alex Shiels, Alex Concha, Anton Timmermans, Andrew Ozz, Aaron Campbell, Andrea Middleton, Ben Bidner, Barry Abrahamson, Chris Christoff, David Newman, Demitrious Kelly, Dion Hulse, Hannah Notess, Gary Pendergast, Herre Groen, Ian Dunn, Jeremy Felt, Joe McGill, John James Jacoby, Jonathan Desrosiers, Josepha Haden, Joost de Valk, Mo Jangda, Nick Daugherty, Peter Wilson, Pascal Birchler, Sergey Biryukov, and Valentyn Pylypchuk.
4.9 Tipton November 16, 2017 Improved theme customizer experience, including scheduling, frontend preview links, autosave revisions, theme browsing, improved menu functions, and syntax highlighting. Added new gallery widget and updated text and video widgets. Theme editor gives warnings and rollbacks when saving files that produce fatal errors.
WordPress users may install and switch among different themes. Themes allow users to change the look and functionality of a WordPress website without altering the core code or site content. Every WordPress website requires at least one theme to be present and every theme should be designed using WordPress standards with structured PHP, valid HTML (HyperText Markup Language), and Cascading Style Sheets (CSS). Themes may be directly installed using the WordPress "Appearance" administration tool in the dashboard, or theme folders may be copied directly into the themes directory, for example via FTP. The PHP, HTML and CSS found in themes can be directly modified to alter theme behavior, or a theme can be a "child" theme which inherits settings from another theme and selectively overrides features. WordPress themes are generally classified into two categories: free and premium. Many free themes are listed in the WordPress theme directory, and premium themes are available for purchase from marketplaces and individual WordPress developers. WordPress users may also create and develop their own custom themes. The free theme Underscores created by the WordPress developers has become a popular basis for new themes.