What Is Wrong with My "checked" Attribute Values

Q

What Is Wrong with My "checked" Attribute Values? - XHTML Tutorials - Introduction To Tag and Attribute Syntax

✍: FYIcenter.com

A

Attribute "checked" is an optional attribute for XHTML element "input". In XHTML specification, attribute "checked" has only predefined value: "checked". However, in HTML specification, attribute "checked" requires no value.

If you are converting existing HTML documents to XHTML format, you will get some syntax error on your pre-selected items in radio buttons, check boxes and dropdown lists, "checked" attributes are used without any values.

Here are some interesting examples of "checked" attributes:

<input type="radio" name="lang" value="HTML" checked> - Invalid, all attributes must have values. This is valid as HTML documents.
<input type="radio" name="lang" value="HTML" checked="yes"> - Invalid, "yes" is not the predefined value of attribute "checked".
<input type="radio" name="lang" value="HTML" checked="checked"> - Valid, attribute "checked" is assigned with predefined vlaue "checked".

2007-05-12, 5344👍, 0💬

What Is the Relation between XHTML and HTML
What Is the Relation between XHTML and HTML? - XHTML FAQs - Introduction To XHTML 1.0 HTML (Hyper-Text Markup Language) is the original markup language for writing Web documents. XHMTL 1.0 is basically the same language as HTML 4.0. But XHTML 1.0 is defined in XML 1.0 syntax. XHTML 1.0 offers the fo... 2007-05-12, 5488👍, 0💬

How To Write Ampersand Sign in Attribute Values
How To Write Ampersand Sign in Attribute Values? - XHTML Tutorials - Introduction To Tag and Attribute Syntax If you need enter an ampersand sign in an attribute value, you can not enter it directly. You must replace it with entity: &amp;. Here are some interesting examples of quoted attribu... 2007-05-12, 5468👍, 0💬

Is Attribute Name Case Sensitive
Is Attribute Name Case Sensitive? - XHTML Tutorials - Introduction To Tag and Attribute Syntax Yes, attribute names are case sensitive. You must write all attribute names in lower case letters. Here are some valid and invalid attribute names: <a href="http://dev.fyicenter.com ">- Valid... 2007-05-12, 5423👍, 0💬

What Is a Required Attribute
What Is a Required Attribute? - XHTML Tutorials - Introduction To Tag and Attribute Syntax A required attribute is an attribute required by the XHTML element. When you write an XHTML element, you must include all attributes required by this element in the opening tag. Optional attributes can be omit... 2007-05-12, 5405👍, 0💬

What Is Wrong with My "checked" Attribute Values
What Is Wrong with My "checked" Attribute Values? - XHTML Tutorials - Introduction To Tag and Attribute Syntax Attribute "checked" is an optional attribute for XHTML element "input". In XHTML specification, attribute "checked" has only predefined value: "checked". However, in HTML specification, att... 2007-05-12, 5345👍, 0💬

What Is the Relation between XHTML and XML
What Is the Relation between XHTML and XML? - XHTML FAQs - Introduction To XHTML 1.0 XML (Extensible Markup Language) is a generic markup language to organize generic information into a structured document with embedded tags. XHTML is entirely based on XML. You can actually say that XHTML is a child... 2007-05-12, 5270👍, 0💬

What Is XHTML
What Is XHTML? - XHTML FAQs - Introduction To XHTML 1.0 XHTML stands for Extensible Hyper-Text Markup Language. XHTML is a scripting language that authors can use to embed text tags into a text document to add structural and formatting information. More precisely, XHTML gives authors the means to: P... 2007-05-12, 5227👍, 0💬

What Are Predefined Attribute Values
What Are Predefined Attribute Values? - XHTML Tutorials - Introduction To Tag and Attribute Syntax Some XHTML attributes have predefined values. If an attribute has predefined values, you must use one of the predefined values. For example, attribute "valign" of element "td" has 4 predefined values "... 2007-05-12, 5162👍, 0💬

What Does an XHTML Document Look Like
What Does an XHTML Document Look Like? - XHTML FAQs - Introduction To XHTML 1.0 An XHTML document is a normal text file with predefined tags mixed with the text contents of the document. Tags are enclosed in pairs of angle brackets: "<" and ">". Below is how a simple XHTML document wil... 2007-05-12, 5147👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.