Rephrasing and reordering, this is the essence: How does this look like in practice? Here is an example showing valid and invalid ways of using tags . Other documents may supersede this document. one missing element to mention is the hard hierarchy of a xhtml page through the code structure. When you start saying actually HR doesnt need a (self-)closing tag then you start having to remember a list of the rules do apply to these things, but not to these things, unless youre in this context in which case you may also need to do this; i.e. The autocomplete attribute has two possible values, on and off (case-insensitively), according to HTML5 LC. Replace the name attribute with the id attribute. Avoid line breaks and multiple white space characters within attribute values. Which is your point. Many existing HTML clients don't support the use of ID-type attributes in this way, so identical values may be supplied for both of these attributes to ensure The file DTD/xhtml-special.ent is a normative part of this specification. Write HTML, the HTML Way (Not the XHTML Way) | CSS-Tricks Attributes like autocomplete and disabled are very different from each other and cannot really be handled as a group. The value of the xml:lang attribute takes precedence. The html, head, title, and body elements must be present. Some HTML user agents are unable to interpret boolean attributes when these appear in their full (non-minimized) form, as required by XML 1.0. Attribute-value pairs must be written in full. Write a DOCTYPE declaration at the start of the XHTML document. Golden States Kevon Looney does Joga. As formally defined, HTML 4 does not allow attributes without a value. What is commonly regarded as attribute without value, as in The annotated contents of this file are available in this separate section for completeness. In order to be You can tell by the rough dates of the specifications, too: HTML 1 1992, HTML 2.0 1995, HTML 3.2 1997, HTML 4.01 1999; XHTML 1.0 2000, XHTML 1.1 2001; HTML5 2007. Attribute values are generally case-insensitive. It brought a cleaner code, less space for interpretation and more consistency. the namespace "xmlns=http://www.w3.org/1999/xhtml" is default, and will be added The value of min and step define what are valid values, even if the step attribute is not included, as step defaults to 0. In SGML these references could be made using either &#Xnn; or &#xnn;. Some input types have a default minimum. These are handled inconsistently by user agents. community and as a result of ongoing work within the HTML Working Group. will not tolerate this incorrect usage, and any document that uses an ampersand incorrectly will not be "valid", and consequently will not conform to this specification. GitHub This is an XHTML document with a minimum of required tags: Note: The DOCTYPE declaration is not a part of the XHTML document itself. "#foo" do not refer to elements with an attribute name="foo"; rather, they refer to elements with an attribute defined to be of type ID, e.g., the id If it encounters an entity reference (other than one of the entities defined in this recommendation or in the XML recommendation) for which the user agent has processed no declaration (which In tables, the tbody element will be inferred by the parser of an HTML user agent, but not by the parser of an XML user agent. Such a document must meet all of the following criteria: It must conform to the constraints expressed in one of the three DTDs found in DTDs and in Appendix B. XHTML is a stricter, more XML-based version of HTML. what is attribute minimization in html XHTML documents can be written to operate as well or better than they did before in existing HTML4-conforming user agents as well as in new, XHTML 1.0 conforming user agents. While in principle, just HTML is leaner and cleaner, the reality is it makes a bunch of assumptions. Entity references as hex values must be in lowercase. The following example shows this difference , You must nest all the XHTML tags properly. We make use of First and third party cookies to improve our user experience. And of course, you can use tools to do this for you. The low attribute value must be greater than the min It might also affect your presentation, if you are not careful. entity reference (e.g. XHTML Within the XHTML namespace, user agents are expected to recognize the "id" attribute as an attribute of type ID. ISO/IEC 9945-1:1990 [POSIX.1]: This version of XHTML provides a definition of strictly conforming XHTML 1.0 documents, which are restricted to elements and attributes from the XML and XHTML 1.0 namespaces. wants to set its character encoding explicitly must include both the XML declaration an encoding declaration and a meta http-equiv statement (e.g., is not as clear as and as a developer you need to remember that you may not be the only person working on a project. XML is a markup language where all documents must be marked up correctly (be "well-formed"). attribute minimization It means you need to explicitly state the attribute and its value. This attribute is constrained such that it can only have the same values as type ID, or as the Name production in XML 1.0 Section 2.3, disabled, readonly, multiple, selected, noresize, defer. Script and style XHTML documents must use lower case for all HTML element and attribute names. Write all XHTML tags and attributes in lower case only. White space handling in attribute values is done according to XML. content of the script or style element within a CDATA marked section avoids the expansion of these entities. Yes. Although overlapping is illegal in SGML, it is widely tolerated in existing browsers. Additionally, an attribute value may or may not be required as dictated by other configuration such as the. XHTML Syntax - W3schools I like avoiding tags such as
because I know browsers are smart to add those and Im not making websites for bots to spam my comments forms, but in general I close my tags. This document is also available in these non-normative formats: Multi-part XHTML file, PostScript version, PDF version, ZIP archive, and Gzip'd TAR archive. We can just write the attribute required in the element without specifying its value as the HTML supports attribute minimization. For example, in HTML, the Formfeed character (U+000C) is treated as white space, in XHTML, due to XML's definition of Note: be aware that if a document must include the character encoding declaration in a meta http-equiv statement, that document may always be interpreted by HTTP servers and/or user agents as Great read, but Id just give it to Pug to format everything for me. Note this problem doesn't affect user agents The annotated contents of this file are available in this separate section for completeness. At the time of publication, the working group believed there were zero patent disclosures relevant to this specification. WebThe lang attribute applies to almost every XHTML element. Readability counts (a lot) in any language syntax. If you want to study XML, please read our XML Tutorial. prohibitions in XML. XML does not support attribute minimization. HTML permits attribute minimization, where boolean attributes can have their value omitted entirely, e.g.,