Clean XHTML syntax_HTML/Xhtml_web page production

Writing XHTML demands a clean HTML syntax.
Writing XHTML demands a clean HTML syntax
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Some More XHTML Syntax Rules:
More XHTML Syntax Rules:
Attribute names must be in lower case be quoted
Use double quotes for attribute values
Attribute minimization is forbidden
Attribute abbreviation is not allowed
The id attribute replaces the name attribute
Replace the name attribute with the id attribute
The XHTML DTD defines mandatory elements
The XHTML DTD defines mandatory elements---------------- -------------------------------------------------- -------------Attribute Names Must Be In Lower Case
Attribute names must be in lower case
This is wrong:
This is wrong:

This is correct:
This is correct:

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Attribute Values ​​Must Be Quoted
Attribute values ​​must be quoted in double quotesThis is wrong:
This is wrong:

This is correct:
That's correct:

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Attribute Minimization Is Forbidden
Attribute abbreviations are not allowedThis is wrong:
This is wrong:






This is correct:
The correct one is this:




Here is a list of the minimized attributes in HTML and how they should be written in XHTML:
This is a list of the minimized attributes in HTML and how they should be written in XHTML: HTML XHTML
compact compact="compact" checked checked="checked"
declare declare="declare"
readonly readonly="readonly"
disabled disabled="disabled"
selected selected="selected"
defer defer ="defer"
ismap ismap="ismap"
nohref nohref="nohref"
noshade noshade="noshade"
nowrap nowrap="nowrap"
multiple multiple="multiple"
noresize noresize="noresize"

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The id Attribute Replaces The name Attribute
id attribute Replaces name attribute
HTML 4.01 defines a name attribute for the elements a, applet, frame, iframe, img, and map. In XHTML the name attribute is deprecated. Use id instead.
For a, applet, frame, iframe, img and map, HTML 4.01 defines a name attribute, which is deprecated in XHTML and uses id instead.
This is wrong:
This is wrong:

This is correct:
This is correct:

Note: To interoperate with older browsers for a while, you should use both name and id, with identical attribute values, like this:Note: For older browsers, you should use both name and id attributes, and make their values ​​​​the same, like this :

IMPORTANT Compatibility Note:Compatibility Note:
To make your XHTML compatible with today''s browsers, you should add an extra space before the "/" symbol.
To make your XHTML compatible with current browsers you should add spaces
-------------------------- before the / tag -------------------------------------------------- ---
The Lang Attribute
Lang Attribute
The lang attribute applies to almost every XHTML element. element. It specifies the language of the content in the element
If you use the lang attribute in an element, you must add the xml:lang attribute, like this:
If you use the lang attribute in an element, you must add On the xml:lang attribute, like this:

Heia Norge!

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Mandatory XHTML Elements
Mandatory XHTML Elements
All XHTML documents must have a DOCTYPE declaration. The html, head and body elements must be present, and the title must be present inside the head element.
All XHTML documents must have a DOCTYPE declaration. The html, head and body elements must appear, and the title must be in the head element
This is a minimum XHTML document template:
This is a minimum XHTML document template
oes here>




Body text goes here
Note: The DOCTYPE declaration is not a part of the XHTML document itself. It is not an XHTML element, and it should not have a closing tag.
Note: The DOCTYPE declaration is not part of the XHTML document itself. It's also not an XHTML element and it shouldn't have a closing tag.
Note: The xmlns attribute inside the tag is required in XHTML. However, the validator on w3.org does not complain when this attribute is missing in an XHTML document. This is because "xmlns=http:// www.w3.org/1999/xhtml" is a fixed value and will be added to the tag even if you do not include it.
Note: XHTML documents require that the xmlns attribute appears in the html tag. However, w3.org's validator will not report an error because this attribute does not appear in your XHTML document. This is because "xmlns=http://www.w3.org/1999/xhtml" is a fixed value, even if it is not included in your document, it will be added automatically.
You will learn more about the XHTML document type definition in the next chapter