How do I view a page with a different character encoding in Firefox? - Super User
In addition, there are some restrictions on how character encoding . In the following example, the disabled attribute is given with the from the intersection of Windows, Chrome, and Firefox defaults. Dates · The HTML5 specification introduced the video element for the purpose of playing videos, . Mozilla and Opera support only the open formats of Theora and WebM . automatically download Cisco's H module when needed by default. that a video file normally contains both video and audio content, each encoded in its. If you have Microsoft Edge set as your default browsers and install another rival web browser, like Google Chrome or Mozilla Firefox, and then.
Those that cannot be omitted must not be omitted.
Void elements only have a start tag; end tags must not be specified for void elements. Foreign elements must either have a start tag and an end tag, or a start tag that is marked as self-closing, in which case they must not have an end tag. The contents of the element must be placed between just after the start tag which might be implied, in certain cases and just before the end tag which again, might be implied, in certain cases. The exact allowed contents of each individual element depend on the content model of that element, as described earlier in this specification.
Elements must not contain content that their content model disallows. In addition to the restrictions placed on the contents by those content models, however, the five types of elements have additional syntactic requirements.
Setting the character encoding in Firefox · HMT documentation
The template element can have template contentsbut such template contents are not children of the template element itself. Instead, they are stored in a DocumentFragment associated with a different Document — without a browsing context — so as to avoid the template contents interfering with the main Document.
Escapable raw text elements can have text and character referencesbut the text must not contain an ambiguous ampersand. There are also further restrictions described below.Computational Thinking - Computer Science for Business Leaders 2016
The HTML syntax does not support namespace declarations, even in foreign elements. For instance, consider the following HTML fragment: In fact, as the comment in the fragment above says, the fragment is actually non-conforming.
This is because the SVG specification does not define any elements called "cdr: Some normal elements also have yet more restrictions on what content they are allowed to hold, beyond the restrictions imposed by the content model and those described in this paragraph. Those restrictions are described below.
History of Firefox - Wikipedia
Start tags must have the following format: If there are to be any attributes in the next step, there must first be one or more space characters. Then, the start tag may have a number of attributes, the syntax for which is described below.
The HTML5 Working Group considered it desirable to specify at least one video format which all user agents browsers should support.
The ideal format in this regard would: Have good compression, good image quality, and low decode processor use. In addition to software decoders, a hardware video decoder should exist for the format, as many embedded processors do not have the performance to decode video. Initially, Ogg Theora was the recommended standard video format in HTML5, because it was not affected by any known patents.
But on 10 Decemberthe HTML5 specification was updated,  replacing the reference to concrete formats: User agents should support Theora video and Vorbis audio, as well as the Ogg container format. However, there are no known codecs that satisfy all the current players: This is an ongoing issue and this section will be updated once more information is available.
Theora and WebM Although Theora is not affected by known non-free patents, Apple  has expressed concern about unknown patents that might affect it, whose owners might be waiting for a corporation with extensive financial resources to use the format before suing. Apple has also opposed requiring Ogg format support in the HTML standard even as a "should" requirement on the grounds that some devices might support other formats much more easily, and that HTML has historically not required particular formats for anything.
Google stated its intention to remove support for H. Such players are, e. Google's purchase of On2[ edit ] Google 's acquisition of On2 in resulted in its acquisition of the VP8 video format. Google has provided a royalty-free license to use VP8.
Firefox nightly builds already include support for AV1. Cisco makes a licensed H.
Cisco will pay the costs of patent licensing for those binary modules when downloaded by the using software while it is being installed, making H. He also noted that the binary module is not a perfect solution, since users do not have full free software rights to "modify, recompile, and redistribute without license agreements or fees".
Thus Xiph and Mozilla continue the development of Daala.