This script is a tweaked copy of User:Ucucha/HarvErrors.js.

Differences:

• messages rendered by this script are normal font size
• error messages have different coloring to distinguish them from cs1|2 and harv/sfn error messages:
  • no-target and target-in-wrong-section errors are DarkOrange
  • multiple-target errors are some-sort-of purple
• when the article does not have CITEREF anchor IDs, does not emit warning messages
• when the article has CITEREF anchor IDs:
  • does not emit warning messages for citations in §§Further reading and External links
  • will emit an error message when a citations in §§Further reading and External links have matching links
  • caveat lector: §§Further reading and External links must be a level 2 sections; spelling and capitalization as shown here:
    • ==Further reading==
    • ==External links==

To install this script, add:

mw.loader.load( '/w/index.php?title=User:Trappist_the_monk/HarvErrors.js&action=raw&ctype=text/javascript' ); // Backlink: [[User:Trappist the monk/HarvErrors.js]]

to Special:MyPage/common.js.

Simple testcases page at User:Trappist the monk/HarvErrors/testcases.

There are three undefined css classes that can be used in your common CSS page or your specific skin's CSS page (common.css and skin.css respectively) for styling the error messages to personal taste. These are:

ttm_harv_err – default color is DarkOrange #FF8C00

ttm_harv_warn – default color is some-sort-of brown #AC6600

ttm_harv_err_dup – default color is some-sort-of purple #C3F

Known issues

• When 'Show previews without reloading the page' is selected at Special:Preferences#mw-prefsection-editing, some pages will not preview:
  • this version of 15th century – preview hangs; (discussion)
• When 'Show previews without reloading the page' is selected at Special:Preferences#mw-prefsection-editing, when in preview, false warnings are emitted for unlinked citations in Further reading.
  • William Allan (painter) (discussion, discussion)
• Testing venue – because of technical considerations, spurious script warnings may be generated if you test your code in Special:ExpandTemplates. If you wish to test your changes first before applying them to an article, please use a sandbox or user subpage, and not Special:ExpandTemplates to do your testing.