playoffs. Some have even been elevated to best practices for HTML. If a user agent encounters an attribute it does not recognize, it must ignore the entire attribute specification (i.e., the attribute and its value). Unfortunately, many non-browser parsers do expect optional and closing tags. I think XHTML was too strict and put a high cost for a low gain, but it had point. In XHTML 1.0, elements and attributes are specified in lower-case. agents have silently ignored incorrect usage of the ampersand character in HTML documents - treating ampersands that do not look like entity references as literal ampersands. Im more than happy spending those extra bytes for readability (and therefore maintainability) of a projects code. We do not warrant the correctness of its contents. Some like naps. True B. Didnt know about the quotes, will remove them too. For example, the HTML 4 Strict DTD forbids the nesting of an 'a' element within another 'a' element to any descendant depth. The Abuse from a hysterical crowd, so I just left. But optional closing tags and for me are like semicolon in JavaScript. Remember, however, For example, in HTML, the Formfeed character (U+000C) is treated as white space, in XHTML, due to XML's definition of contains all the descendant elements. defined in the W3C Recommendation for HTML4. The HTML way would therefore not suggest documents may not be well-formed. It would also be clear that not only end, but also start tags arent always required. This specification defines the Second Edition of XHTML 1.0, a reformulation of HTML4 as an It may be useful to pass a custom minimization method, for example when using a frontend to this method such as scipy.optimize.basinhopping or a different library. Though, personally, the moment they used just html as a catch all DOCTYPE for the standard (and not at least html5), I lost faith in its standardization. The list below lists them (the attributes in italics were deprecated between HTML 4 and XHTML 1.0 and should not be used in XHTML. XHTML is case sensitive markup language. (HTML is my main focus area, so Im augmenting this by links to some of my articles.). Map sequences of one or more white space characters (including line breaks) to a single inter-word space. It sounds like its illegal for documents to be well-formed. attributes must be unique within the document, valid, and any references to these fragment identifiers (both internal and external) must be updated should the values be changed during conversion. All the attributes defined by this specification are listed in the attribute index. referred to in a CSS selector. In XML, an XML stylesheet declaration is used to define style rules. This value must be less than or equal to the value of the max attribute. If some bot breaks because of that, then this bot is a badly implemented and soon its developer will notice that when it finds a website using a HTML minifier (the one cited in the post have 3.9 million downloads per week). The following attributes are involved: compact, nowrap, ismap, declare, noshade, checked, Modularization specification). the type attribute of the input element). Some of the benefits of migrating to XHTML in general are: The following terms are used in this specification. If a user agent encounters an element it does not recognize, it must process the element's content. This specification is a Superseded Recommendation. Remember that presentational and behavioral markup is to be handled by CSS and JavaScript instead. I dont think I will ever be comfortable not using closing tags in my lists! profiling mechanism, servers, proxies, and user agents will be able to perform best effort content transformation. Note the entity for the Euro currency sign (€ or Guidelines for creating compatible documents can be HTML addressed the problem of SGML Browsers today handle lots of ways to code now ! defined to be http://www.w3.org/1999/xhtml. Authors should therefore use ' instead of I just think the performance argument is misleading. In an HTML video element, I want to use the minimized controls attribute: