Html
HTML, sef acronym am Hyper Text Markup Language, yw'r brif iaith i ysgrifennu tudalennau gwe.
Mae'n darparu modd i ddisgrifio strwythur y testun mewn dogfen, gan ddynodi'r testun fel penawdau, paragraffu, rhestri ac yn y blaen, ac i ymestyn ar y testun hyn gyda delweddau, ffurflenni rhyngweithiol a gwrthrychau eraill.
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| Enghraifft o'r canlynol | web API, W3C Recommendation, gwaith creadigol, file format family, Iaith tagio, ISO standard  |
|---|---|
| Math | Iaith tagio |
| Dyddiad cyhoeddi | 1993 |
| Dechrau/Sefydlu | 1989 |
| Statws hawlfraint | dan hawlfraint |
| Gwladwriaeth | y Deyrnas Unedig |
| Gwefan | https://html.spec.whatwg.org/multipage/ |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
Ysgrifennir HTML gyda labeli a elwir yn tag. Amgylchynir pob tab gyda < a >, e.e. .
Dyma enghraifft fer o ddogfen HTML:
<html> <head> <meta charset="UTF-8"> <title>Dyma esiampl o dudalen HTMLtitle> head> <body> <h1>Dyma pennawd lefel 1h1> <p>Dyma baragraff.p> body> html> Darllen pellach
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