Macromedia dreamweaver 8-extending dreamweaver User Manual

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Working with browser profiles
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3.
Add any new tags or attributes that you know are supported by the browser, using the 
syntax shown in 
If you don’t want to receive error messages about a particular unsupported tag, add it to 
the list of supported tags. If you do this, save the profile in a separate file with a new 
filename (such as Browsername x.x limited). Giving this alternate profile a new name 
preserves the original profile with only the tags that are truly supported.
4.
Delete any tags or attributes that are not supported by the browser.
This step is probably unnecessary if you are creating a profile for a new version of 
Netscape Navigator or Internet Explorer because browsers rarely drop support for tags.
5.
Add any custom error messages according to the syntax shown in 
The profiles that come with Dreamweaver list all supported tags for the specified 
browsers. To add a custom error message to a tag, type
 !msg = "message"
 after 
!Error
The following example shows information that appears in the Netscape Navigator 3.0 
profile (along with other attributes not shown here):
<!ELEMENT HR name="Horizontal Rule">
<!ATTLIST HR
COLOR !Error
>
To add a custom error message enter !msg= followed by your error message in quotation 
marks ("):
<!ELEMENT HR name="Horizontal Rule">
<!ATTLIST HR
COLOR !Error !msg="Internet Explorer 3.0 supports the COLOR tag in
horizontal rules,but Netscape Navigator 3.0 does not."
>
6.
You can use 
!Error
 for all error situations, or you can use 
!Warning
 or 
!Info
 to indicate 
that a tag will be ignored but will not actually cause an error.