Watch Link

Watch Link (also known as a Watch URL) is the unique URL parameter given by YouTube to an uploaded video. The video ID, the string of characters at the end of the v URL parameter, works almost like a mapped to the character parameters stated below, although it is unknown whether there are correlations between the video metadata and the created string, or whether the generated string is purely random.
== Format and example ==
The video ID may contain capital (A-Z) and uncapitalised letters (a-z) of the latin alphabet, latin numbers (0-9), dashes (-), and underscores (_). The length of the string is always 11 characters long, giving a possible permutation count of 64^{11} or about (73 quintillion, 786 quadrillion, 976 trillion, 294 billion, 838 million, 206 thousand, 464) different permutations.
The format is as follows:
https://www.youtube.com/watch?v=[string]
One can use Regular Expressions with the following character set pattern to match the watch link ID:
/[0-9a-zA-Z-_]{11}/
== Usage ==
=== YouTube API ===
The YouTube Data API requires the inclusion of the video ID on its endpoints to specify and target specific individual videos.
=== Embedding ===
Users can embed videos using either YouTube's embed <iframe> feature, or by using Wikitubia's EmbedVideo extension.
==== YouTube embed ====
The default YouTube embed format is as follows:
URL 	Example
https://www.youtube.com/embed/VIDEO_ID	
<iframe width="560" height="315" src="https://www.youtube.com/embed/dQw4w9WgXcQ" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
The YouTube embed endpoint (/embed/) offers a lot of customisation that can be done either manually, or using the editor contained in the "Share" button. One such customisation is hiding the media controls done by appending ?controls=0 as a URL parameter to the embed code, YouTube even offers a youtube-nocookie.com/embed/ domain that doesn't harvest analytical data unless the user plays the video manually.
==== EmbedVideo extension ====
Wikitubia has the EmbedVideo extension enabled, and is used in some Infobox templates on YouTubers' articles, the syntax is as follows:
Syntax	Example
{{#ev:youtube|VIDEO_ID}}	
Category:YouTube
Category:History of YouTube