css|xhtml| Standard | beginners | design
1, except the choice DOCTYPE statement must use the lowercase English letter to write。 These include mouse actions generated by Macromedia Dreamweaver, such as OnMouseOver, which must also be modified to OnMouseOver.
2. XHTML regulations require that all logos must have a beginning and an end. For example, <body> and </body>, <p> and </p>, for a pair of identifiers, require a space in the logo and then a "/". For example <br> written <br/>, written as
3. All XML tags must be nested properly。 If:<p><b></p></b> must be modified to:<p><b></b></p>, that is, a layer of nesting must be strictly symmetric.
4. All attributes must be enclosed in quotation marks "". such as:
5, all < and & special symbols expressed in code. For example: any less than (<), not part of the label, must be encoded as & L T; , any greater-than sign (>), which is not part of the label, must be encoded as & G T; , any number (&), which is not part of the entity, must be encoded as & a M p;. (no spaces between the letters)
6. Assign a value to all attributes. such as: <td nowrap> <input type= "checkbox" name= "Shirt" value= "medium" checked> must be modified to: <TD nowrap= "nowrap" > <input type= "checkbox" name= "Shirt" value= "Medium" checked= "checked" >.
7, do not use "--" in the annotation content. such as:<!--here is the annotation-----------here is the annotation--> can replace the inner dotted line with an equal sign or a space <!--here is the annotation ============ here is the annotation-->.
The first part is the specification of the file header:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "<a href=\"
HTTP://WWW.W3.ORG/TR/XHTML1/DTD/XHTML1-TRANSITIONAL.DTD\ "target=\" _blank\ ">
HTTP://WWW.W3.ORG/TR/XHTML1/DTD/XHTML1-TRANSITIONAL.DTD</a> ">
http://www.w3.org/1999/xhtml\ "target=\" _blank\ ">
http://www.w3.org/1999/xhtml</a> "lang=" Utf-8 ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<meta http-equiv= "Content-language" content= "Utf-8"/>
<meta content= "All" name= "robots"/>
<meta name= "Author" content=webjx@webjx.com,webjx/>
<meta name= "Copyright" content= "WEBJX, All rights reserved, reproduced annotated source"/>
<meta name= "description" content= "Web Teaching Network"/>
<meta content= "Web page, Web page, Web page, Web design, Web page, Web page, book, web video" name= "keywords"/>
In terms of the definition of CSS, it is worth recommending a common font setting, which reads as follows:
Body {font-family: "Lucida Grande", Verdana, Lucida, Arial, Helvetica, XXFarEastFont-Franklin, Sans-serif;
Fonts are selected in the order listed. If the user's computer contains Lucida Grande fonts, the document is specified as Lucida Grande. If not, it is specified as a Verdana font, and if there is no Verdana, specify the Lucida font, and so on;
Lucida Grande fonts for Mac OS X;
Verdana fonts are suitable for all Windows systems;
Lucida for UNIX users;
"Song body" suitable for Chinese simplified users;
If none of the fonts listed are available, the default Sans-serif font guarantees the invocation.
CSS uses four pseudo classes to define the style of the links, respectively: A:link, a:visited, A:hover, and a:active, for example:
a:link{font-weight:bold; text-decoration:none; color: #c00;}
a:visited {font-weight:bold; text-decoration:none; color: #c30;}
a:hover {font-weight:bold; text-decoration:underline; color: #f60;}
a:active {font-weight:bold; text-decoration:none; color: #F90;}
But when writing must pay attention to the order, the correct order is: LVHA, if not so, it is likely that the effect is not the same as you expected.
The layout normalization of the middle part and the non-tabular implementation of the menu need to be guided by practice, not to write anything here first. Write a note about the code checksum below.
XHTML checksum common error reason tables:
No DOCTYPE found! Falling back to HTML 4.01 transitional--undefined doctype.
No Character Encoding found! Falling back to utf-8.--does not have a defined language encoding.
End tag for "IMG" omitted, but Omittag no is specified--picture label is not added "/" off.
An attribute value specification must a attribute value literal unless Shorttag YES is specified--property values must be quoted.
Element "div" Undefined---div tag cannot be capitalized, to be converted to lowercase div.
Required attribute "alt" not specified---picture requires an Alt property.
Required attribute "Type" is not specified---JS or the label of the CSS call misses the Type property.
CSS2 Check Common error reason tables:
(warning) Invalid number: color909090 is not a color value: 909090---Hexadecimal color value must be added with the "#" number, that is #909090
(warning) Invalid number: Margin-topunknown dimension:6pixels---Pixels is not a unit value, the correct spelling 6px
(warning) Property Scroll_bar-face-color does not exist: #eeeeee---Defines a nonstandard property of the scroll bar color
Warning line:0 font-family: It is recommended that you designate a family of species as the final option--w3c suggest font definitions, and end up with a category of fonts, such as "Sans-serif" to ensure that, under different operating systems, page fonts can be displayed
Warning Line:0 can ' t find the warning messages for Otherprofile--Indicates that there are non-standard attributes or values in the code, and that the validator is unable to determine and provide the appropriate warning information
also attached:
XHTML checksum common error reason tables
No DOCTYPE found! Falling back to HTML 4.01 transitional--undefined doctype.
No Character Encoding found! Falling back to utf-8.--does not have a defined language encoding.
End tag for "IMG" omitted, but Omittag no is specified--picture label is not added "/" off.
An attribute value specification must a attribute value literal unless Shorttag YES is specified--property values must be quoted.
Element "div" Undefined---div tag cannot be capitalized, to be converted to lowercase div.
Required attribute "alt" not specified---picture requires an Alt property.
Required attribute "Type" is not specified---JS or the label of the CSS call misses the Type property.
One of the most common bugs is the case of a label. Usually these errors are related, such as forgetting a </li> other <li> tags will be an error, so do not see a bunch of false fear, usually solve a mistake, the other mistakes are not
