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Читать полностью, поиск, поставщики и магазины, цены в Казахстане A user account is required in order to edit this wiki, but we've had to disable public user registrations due to spam.
To request an account, ask an autoconfirmed user on such as one of.
Some information is incomplete or missing.
Please note that the information in here is based upon the current spec for X HTML5.
Some of the issues technically do not apply to previous versions of HTML.
Although HTML and XHTML appear to have similarities in their syntax, they are significantly different in many ways.
Note: As the current WHATWG document is a draft, this section will need to track to a moving target.
The document at provides a similar analysis.
Overlap Language There is a community who find it valuable to be able to serve HTML5 documents which are also valid XML documents.
They may, for example, use XML tools to generate the document, and they and others may process the document using XML tools.
This language is sometimes called "polyglot".
It is the overlap language of documents which are both HTML5 documents and XML documents.
Guidelines are listed below for how one can construct such a polyglot document which will work in either environment.
This wiki web page is an example of such a document.
You can parse it with an XML parser or an HTML parser.
It is the MIME type which may or may not be determined by file extension that determines what type of document you are using.
Note that XHTML 1.
Syntax and Parsing XHTML uses XML parsing requirements.
HTML uses its own which are defined much more closely to the way browsers actually handle HTML today.
The following table describes the differences between how each is parsed.
The column on "Guidance for XHTML-HTML compatibility" lists ways in which a document can be crafted to work in either XHTML or HTML.
The item will be bolded if it is a requirement for XHTML-compliant code to be changed, since XHTML will otherwise usually work as HTML, at least if its full features are constrained.
Feature HTML Requirement XHTML Requirement Notes Guidance for XHTML-HTML compatibility Parsing Modes Three parsing modes are defined: no quirks mode, quirks mode and limited quirks mode.
The mode is only ever changed from the default by the HTML parser, based on the presence, absence, or value of the DOCTYPE string, respectively.
XML parsing rules are used.
There is only one mode.
The parsing modes in HTML also have an effect upon script and stylesheet processing.
XHTML is considered to be in no quirks mode for these purposes.
Use an explicit case insensitively or legacy-compat version for the sake of HTML and thus trigger no quirks parsing.
Error Handling HTML does not have a well-formedness constraint, no errors are fatal.
Graceful error handling and recovery procedures are thoroughly defined.
Well-formedness errors are fatal Ensure there are no well-formedness errors.
Character Encoding including XML Declaration, meta The XML declaration is forbidden читать as a bogus comment, but such style of comments are deprecatedbut the meta element with charset attribute may be used instead.
If the encoding is unspecified in HTML, it should determined through implementation specific heuristics or fallback to a default value Note: this section of the spec is not yet finished.
The XML declaration may be used towhile meta is only allowed as case-insensitive "UTF-8" and is ignored if included.
The default character encoding for XHTML is, according to XML rules, UTF-8 or UTF-16.
If you need to include XML 1.
For future compatibility, it would be to avoid XML 1.
Do not use a meta tag, unless it is UTF-8 and included in the first 512 bytes of the documentin which case it is probably a good idea to include it for the sake of HTML as in case you cannot specify such in a content header.
Namespaced elements Elements and attributes for known vocabularies HTML, SVG and MathML are implicitly assigned to appropriate namespaces, according to the rules specified in the parsing algorithm.
Elements in the HTML, SVG, or MathML namespaces may have an xmlns attribute explicitly specified, if, and only if, it has the exact value "" see.
The attribute has absolutely no effect.
It is basically a talisman.
It is allowed merely to make migration to and from XHTML mildly easier.
When parsed by an HTML parser, the xmlns attribute itself ends up in no namespace.
Foreign elements are also not treated as being in another namespace and will have no effect except for displaying by default as inline elements and be aware that self-closing elements cannot be used as such since unrecognized elements will be treated as though they are non-void; thus one cannot, for example, type in HTML or it will be treated as though there is no immediate closing tag.
Namespaced узнать больше здесь are not allowed посетить страницу источник HTML elements; a prefixed xmlns attribute cannot be used even if it is defined in the XHTML namespace.
The XHTML namespace must be declared for HTML elements according to the rules defined by the specification.
Namespaces must be explicitly declared.
The xmlns attribute ends up in the "" namespace.
Foreign elements can be used independently of HTML elements, as long as they assigned to their own namespace.
Declare HTML namespaces or other namespaces explicitly and do not prefix XHTML elements.
Do not depend on the behavior of foreign namespaced elements in an HTML setting; if you need to include these, you will probably wish to set this foreign markup via CSS to display:none.
You should explicitly close not self-close all empty elements defined in a non-XHTML namespace, since otherwise when used in HTML, HTML will treat them as though they have not been closed.
Namespaced attributes on HTML elements Attributes of the form xmlns: prefix may not be used on HTML elements.
The xmlns: prefix attributes end up in the "" namespace.
Do not use namespaced attributes on HTML elements.
Do not depend on the behavior of foreign attributes in an HTML setting.
Namespace attributes on foreign elements Elements in the SVG namespace may have an xmlns attribute specified, if, and only if, it has the exact value "".
узнать больше здесь attribute is optional because the namespace is implied during parsing.
Elements in the MathML namespace may have an xmlns attribute specified, if, and only if, it has the exact value "".
The attribute is optional because the namespace is implied during parsing.
Foreign elements may also have an xmlns:xlink attribute specified, if, and only if, it has the exact value "".
This attribute is optional, even if XLink attributes are used, because the namespaces for XLink attributes is implied during parsing.
When parsed by an HTML parser, the xmlns and xmlns:xlink attributes end up in the "" namespace.
The SVG and MathML namespaces must be declared for SVG href="https://greenl66.ru/100/kabelnaya-buhta-panduit-puc6004ig-ey.html">по этой ссылке MathML elements, respectively, according to the rules defined by Namespaces in XML.
The xmlns and xmlns: prefix attributes end up in the "" namespace.
XLink attributes Foreign elements may use the attributes xlink:actuate, xlink:arcrole, xlink:href, xlink:role, xlink:show, xlink:title and xlink:type.
These attributes are placed in the "".
The prefix used must be " xlink".
XLink attributes may be specified on foreign elements using any prefix, subject to the conformance rules defined by Namespaces in XML.
The XLink namespace must be according to the conformance rules defined by Namespaces in XML if XLink attributes are used within the document.
Do not use XLink attributes on HTML elements and do not depend on them on foreign elements as will not work as such in HTML.
If being used, ensure they have the appropriate XLink namespace defined.
XML attributes Foreign elements may use the attributes xml:lang, xml:id, xml:base and xml:space.
These attributes are placed in the "".
The prefix used must be " xml".
HTML elements may use the xml:lang attribute.
The attribute in no namespace with no prefix and with the literal localname " xml:lang" has no effect on language processing as does " lang".
HTML elements must use the xml:base, xml:space, or xml:id attributes.
Any element, including HTML elements, may use the attributes xml:lang, xml:id, xml:base and xml:space.
The prefix used must be " xml".
Though they can be used on foreign elements, do not use xml:base, xml:id, or xml:space on HTML elements; use both xml:lang and lang attributes whenever one is to be needed on HTML elements.
Attributes Names are not case sensitive.
Attribute minimization is allowed i.
Names are case sensitive and lower case.
Attribute minimization is not allowed.
Use lower case attribute names.
Do not minimize attributes.
Non-namespaced attributes not belonging to HTML will be included in the DOM tree and accessible to script and stylesheets, but it is discouraged to use these due to the potential for future naming conflicts; data- attributes can be used instead, or if in an XML-only environment, namespaced attributes.
Attribute values White space characters are not normalized.
Unquoted attribute values are allowed.
Fixed or default attribute values.?
White space characters are to single spaces unless attribute is of CDATA type?
Unquoted attribute values are not allowed.
Default attribute values could conceivably be defined with a DTD.
Create whitespace in attribute values which is already normalized converted to single spaces.
Always quote attribute values.
Do not rely on defining default or fixed attribute values or elements with exclusively element content in a DTD unless it matches HTML behavior.
Form feed characters are discouraged in XML 1.
Do not use the form feed character.
The DOCTYPE A DOCTYPE is a mostly useless, but required, header.
The DOCTYPE is used during parsing to determing the parsing mode.
The keywords " DOCTYPE", " PUBLIC" and " SYSTEM", and the name " html" are treated case insensitively.
The system identifier "about:legacy-compat" and the public and system identifiers for previous versions of HTML are case sensitive.
Conforming HTML documents are required to use case insensitively or the legacy-compat version.
When using the obsolete but conforming DOCTYPEs based on the HTML 4.
The obsolete but conforming DOCTYPEs based on XHTML 1.
Use of an internal subset is forbidden.
The system identifier is never de-referenced by HTML implementations.
The DOCTYPE is optional.
XML rules for case sensitivity apply everything is case />Either of the DOCTYPEs defined in HTML5 may be used, or any other custom DOCTYPE.
If the public identifier is specified, the system identifier must also be specified.
The obsolete status of the obsolete permitted DOCTYPEs defined for HTML does not apply to XHTML.
Any DOCTYPE may be used, subject to the conformance rules defined by XML.
Use of an моему Плоскогубцы Кобальт 647-338 ответ subset is permitted according to the requirements of XML.
Some validating XML processors may dereference the system identifier, used, but most browsers use non-validating processors.
Use the empty DOCTYPE with no SYSTEM or PUBLIC identifiers and no use of internet subset.
Element names Element names are case insensitive.
Element names are case sensitive and lower-case.
Only use lower-case element names as with attributes.
Non-void Elements Void elements only have a start tag; end tags must not be specified for void elements, and it is impossible for them to contain any content.
A trailing slash may optionally be inserted at the end of the element's tag, immediately before the closing greater-than sign.
For non-void elements e.
Void elements may use either the empty-element tag syntax EmptyElemTag or KEAZ Выключатель автоматический ВА57-31-340010-50А-800-690AC-УХЛ3-КЭАЗ a start tag immediately followed by an end tag, with no content in between.
While it is possible for the element to contain content, this is non-conforming.
For void elements e.
For non-void elements, i.
Unexpected end tags Unexpected end tags in HTML, an unexpected or can cause the start tag to be implied before it.
Unexpected end tags are well-formedness errors.
Do not add end tags unless there is an explicit and properly nested open tag before it.
End tag with attributes?
An end tag with attributes is not allowed.
Do not use end tags with attributes.
For example, the end tag for the p element is implied by a subsequent p element.
Omitting the end tag for other elements is a parse error and various error recovery procedures are applied appropriately.
End tags must be explicitly included for all elements, except empty elements using the EmptyElemTag syntax.
Always use end tags or self-closing tags for void elements.
Violating these constraints is a parse error увидеть больше various error recovery procedures applied appropriately.
The content of comments must not contain two consecutive U+002D HYPHEN-MINUS - characters, nor end with a hyphen.
Violating this is a well-formedness error.
Only use comments of the " " variety.
Do not use two consecutive U+002D HYPHEN-MINUS - characters in comment content or end with such a hyphen especially for the sake of XML.
Processing Instructions HTML does not allow processing instructions and deprecates the bogus comments which appear in their form, whether in the form without a closing '?
XHTML allows the use of XML processing instructions which are only closed by "?
Processing instructions might need to be avoided entirely in case Бумага инженерная Xerox.
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CDATA sections is a a bogus comment.
An exception is made for foreign content such as SVG or MathML.
Unescaped ampersands and less-than signs may not appear within CharData or AttValue basically, the normal text content of elements and attribute values.
Violation of this constraint is a well-formedness error.
Always escape ampersands and less-than signs in text content and attribute values.
Character References The 'x' in a hexadecimal character reference can be upper-case.
The 'x' in a hexadecimal reference cannot be upper-case.
Only use the lower-case for hexadecimal character references.
Entity References In HTML, all entity references are predefined and do not require a DTD.
There is no formal DTD for XHTML5, but one https://greenl66.ru/100/chen-carol-family-my-dad-and-i-cd-beginner-level-cd-rom.html provide an exteranl DTD if not an internal subset?
Some still have bugs in that they mistakenly create a well-formedness error out of such missing entities instead of showing them as missing, making them clickable, or a entity-checking or validating parser.
Character data Unicode characters except for U+0000, non-characters, and control characters besides space characters.
Discouraged in XML 1.
Element s HTML Requirement Requirement Notes Guidance for XHTML-HTML compatibility script and style In HTML, these are parsed as CDATA elements.
Note: the definition of CDATA differs from that in XML.
In XML, they're parsed as normal elements which means that things that look like comments are treated as real comments, and things that look like start tags actually are start tags.
The following code with escaping can ensure script and style elements will work in both XHTML and HTML, including older browsers.
In HTML, older browsers might display the content without the content being within a comment, so comments are used to hide this from them while modern HTML browsers will run code inside the comments.
Note: The definition of RCDATA differs from that in SGML.
If scripting is disabled, it's parsed as a normal element.
In XHTML, the element is always parsed as a normal element, and can't really be used to stop content from being present when script is disabled.
In XHTML, they are parsed as normal elements, and therefore do not stop content from being used.
Do not use these elements out of context.
In the case of directly inside aone may use an explicit tbody to avoid potential confusion.
It is, however, forbidden.
Do not use plaintext.
In XML, it is treated as other content.
Add any line break before the element begins using HTML or CSS.
посетить страницу head base, link, metain body area, br, col, embed, посмотреть еще, img, input, param, and now also link and meta These elements are void elements in HTML.
In XHTML, these may use explicit closing tags as well as self-closing ones just as non-void elements can.
Do not use an explicit closing tag for these void elements to avoid double-inclusion when shown in HTML and avoid self-closing tags on non-void elements which can sometimes accept content such as.
HTML Elements with Optional Tags For polyglot texts, always use the start and ending tag unless it a void element, in which case, self-closing tags must be used.
Element Start Tag End Tag html optional optional head optional optional body optional optional li required optional dt required optional dd required optional p required optional colgroup optional optional thead required optional tbody optional optional tfoot required optional tr required optional th required optional td required optional rt required optional required optional optgroup required optional option required optional Scripts Feature HTML Requirement XHTML Requirement Notes Guidance for XHTML-HTML compatibility document.
These be used in XHTML.
Use DOM methods to replace or add content dynamically.
The use of https://greenl66.ru/100/inzhenernaya-doska-boen-boen-dub-1000-x-100-x-105-mm-maxi-sort-rustic-brashirovannaya-faska-2v-a-1.html property requires that the string be a well-formed fragment of XML.
Ensure one sets innerHTML to well-formed fragments.
DOM APIs and case sensitivity Some DOM APIs are case insensitive in HTML which are sensitive?
This does not apply to elements which are not in the HTML namespace.
DOM APIs are case sensitive in XHTML Use lower-case elements, attributes, and attribute values or as appropriate with SVG camel-cased elements and attributes and the "definitionURL" attribute should use перейти на страницу casing when used in MathML.
These properties return the value in lower-case XHTML.
For older browsers, compare after converting to lower case.
Do not expect to use upper-case attribute names.
Do not expect to keep upper-case attribute names for HTML-namespaced elements after a rename.
In XML including true XHTMLthe namespace is defined by both DOM2 and DOM3 to be null.
In XHTML, browsers lack interoperability this area.
In Firefox and Safari, the namespace is dependent upon the MIME type.
In Opera, it's dependent upon the root element.
If operating within a browser which supports it, use Document.
XPath expressions In pre-HTML5 browsers, the XHTML namespace must be used for XHTML and null for HTML.
HTML5 browsers would use the XHTML namespace even in HTML.
In XHTML, all XPath will require a namespace unless the elements genuinely have no namespace.
Detect whether the browser is pre-HTML5 and omit namespaces in XPath expressions if so otherwise, use a namespace.
Stylesheets HTML Requirement XHTML Requirement Notes Guidance for XHTML-HTML compatibility CSS Selectors Match case insensitively in HTML.
Match case sensitively in XHTML For polyglot documents, lower-case selectors or as appropriate e.
Style the html and body elements appropriately?
Differences Between HTML4 and HTML5 See.
Differences Between DOM Level 2.