152062 - [RFE] Selective substitution of CSS on foreign sites

Status: RESOLVED DUPLICATE of bug 41975

(SeaMonkey :: UI Design, enhancement)

Description

[Malx]

I whould like to request a feature.
When I visit a site and I do not like some CSS setting (for example white
background) I need to have a way to change it (white -> grey).
So next time in View->Use Style I whould see "Custom user style" for this site.
It is something like selective "Block images", but it is for CSS.

Better if there whould be bug #17534 , but even without it - simple diff and
text edit whould do (open text edit. Ask user to edit current CSS. Check for
diff(or even save all new style). save it somewhere to be accessible from
View->Use Style).

Could DOM inspector be used as CSS editor for this feature?

If someone is interested - I am using now quick fix. A have add in Bookmarks
item with
URL="javascript:void(window.document.body.style.backgroundColor='#777777')"
It is possible to alter any style (all at onece) with such hack, but is is not
easy to edit this :)
javascript:{document.styleSheets.item(0).cssRules.item(6).style.cssFloat="left";document.styleSheets.item(0).cssRules.item(5).style.cssFloat="left";document.styleSheets.item(0).cssRules.item(3).style.cssFloat="left";document.styleSheets.item(0).cssRules.item(4).style.cssFloat="left";alert(a)}

Comment 1

[Garth Wallace]

Feature requests should have severity "enhancement".

Comment 2

[Jesse Ruderman]

Editing the site's existing style sheet would not always work.  Some sites use
HTML instead of CSS for styles, some sites use inline styles instead of the
<style> element, and some sites have mutliple style sheets.  Also, diffing CSS
should not be necessary.  That's what cascading is for.

Related bugs:

bug 45848 ability to have multiple user style sheets.
bug 41975 remember your choice of user style sheets for each site.
bug 83663 remember your choice of author style sheets for each site.
bug 32372 add "ignore all author styles" to the choice of author style sheets.

Here are some tools your might find useful:

http://www.squarefree.com/bookmarklets/webdevel.html#test_styles: this
bookmarklet opens a window into which you can type a new style sheet for the
current page/site.  You often need to use !important because a style sheet added
through a bookmarklet is considered to be an author style sheet rather than a
user style sheet.

http://www.squarefree.com/userstyles/make-bookmarklet.html: creates a
bookmarklet based on CSS you type so you don't have to keep entering the same
code into the test styles bookmarklet.

Comment 3

[Michael Lefevre]

I don't think this is different enough to be a separate bug. It's a combination
of per site user css, and having a css editor, both of which are already filed.

*** This bug has been marked as a duplicate of 41975 ***