at all. Formatting Unofficially the format has very basic text formatting, which can be either interpreted or passed through for rendering depending on the processing application. Formatting is derived from HTML tags for bold, italic, underline and color: Bold – <b>…</b> Italic – <i>…</i> Underline – <u>…</u> Font color – <font color="color name or #code">…</font> (as in HTML) Line position – X1:… X2:… Y1:… Y2:… after the timestamp would denote the text coordinate Nested tags are allowed; some implementations prefer whole-line formatting only. Compatibility The SubRip .srt file format is supported by most software video players. For Windows software video players that do not support subtitle playback directly, the VSFilter DirectX filter displays SubRip and other subtitle formats. The SubRip format is supported directly by many subtitle creation and editing tools, as well as some hardware home media players. In August 2008, YouTube added subtitle support to its Flash video player under the "Closed Captioning" option – content producers can upload subtitles in SubRip format. Text encoding SubRip's default output encoding is configured as Windows-1252. However, output options are also given for many Windows code pages as well Unicode encodings, such as UTF-8 and UTF-16, with or without byte order mark (BOM). Therefore, there is no de facto character encoding standard for .srt files, which means that any SubRip file parser must attempt to use Charset detection. Unicode BOMs are typically used to aid detection. SubViewer In 1999, Brain created SubRip, and a friend, David Dolinski, created SubViewer, who offered it for download on his personal website. SubViewer was included in the DivX media player. On August 28, 2008, YouTube included support for SubViewer and SubRip, allowing existing videos to be retroactively subtitled. WebVTT A format originally called WebSRT (Web Subtitle Resource Tracks) was specified in 2010 by the Web Hypertext Application Technology Working Group for the proposed HTML5 <track> element. It shared the .srt file extension and was based on parts of the SubRip format, but was not fully compatible with it. The prospective format was later renamed WebVTT (Web Video Text Track). Google's Chrome and Microsoft's Internet Explorer 10 browsers were the first to support tags with WebVTT files for HTML5 videos. Mozilla Firefox implemented WebVTT in its nightly builds (Firefox 24), and as of Firefox 31 (July 24, 2014), Mozilla enabled WebVTT on Firefox by default. YouTube began supporting WebVTT in April, 2013. See also Closed captioning