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You can customize how inline citations and reference lists appear to you when you are logged into your account by adding any of these rules to your CSS. After editing, bypass your cache.

Reference list[edit]

Adjust font size 

/* Set the font size for reference lists */
ol.references,
div.reflist,
div.refbegin {
  font-size: 90%;
}

Change 90% to the desired size. See also Special:Preferences → Gadgets → Disable smaller font sizes of elements such as Infoboxes, Navboxes and References lists.

Suppress display 

/* Suppress display of the reference list */
ol.references {
  display: none;
}

Highlight clicked reference in blue 

/* Highlight clicked reference in blue to help navigation */
ol.references li:target,
sup.reference:target,
span.citation:target {
  background-color: #DEF;
}

See web colors.

Put in a box with a scrollbar 

/* Reference list in a box with a scrollbar */
@media screen {
  div.reflist {
    overflow-x: hidden;
    overflow-y: auto;
    padding-right: 0.5em;
    max-height: 320px;
  }
}

To show the reference list in a collapsible box, see User:TheDJ/Folded references.

Disable columns 

/* Disable columns for ((reflist)) and ((refbegin)) */
.references-column-count, .references-column-width {
  column-count: 1 !important;
  column-width: auto !important;
}

To set a fixed number of columns, change 1 to the desired number.

Add dividers (rules) between columns 

/* Add dividers (rules) between columns */
.references-column-count, .references-column-width {
  column-rule: 1px solid #aaa;
}

You can alter the appearance of the dividers by changing the values.

In-text cites[edit]

Hide in-text footnote markers

Edit your common JavaScript and add: ((subst:lusc|User:Zhaofeng Li/RefToggle.js))

Don't include citation numbers when selecting text (e.g. to copy and paste)

Edit your CSS to add: 

sup.reference { user-select: none; } /* Don't copy citation numbers */

Keep reference superscript and subscript text from breaking the line-spacing 

#content sup.reference {
  vertical-align: baseline;
  position: relative;
  bottom: 0.33em;
}

#content sub.reference {
  vertical-align: baseline;
  position: relative;
  bottom: -0.25em;
}

Prevent wrapping

This fixes a cosmetic issue with Internet Explorer where a wikilink followed immediately by an in-text cite may cause the link and cite to be underlined together; not supported by IE6 and IE7 

/* Add a zero-width space before the in-text citation */
sup.reference:before {
  content: "\200B"; text-decoration: none;
}

This will join the in-text cite to the preceding text, preventing it from wrapping; it does not add a space; does not work for Internet Explorer 

/* Add a zero-width joiner before the in-text citation */
sup.reference:before {
  content: "\200D"; text-decoration: none;
}

Add a space before the in-text citation

This will join the in-text cite to the preceding text, preventing it from wrapping; a space will show between the text and the in-text cite; not supported by IE6 and IE7 

/* Add a non-breaking space before the in-text citation */
sup.reference:before {
  content: "\A0"; text-decoration: none;
}

Hide the brackets for the inline cite 

/* Hide the brackets for the inline cite */
sup.reference a span {
  display: none;
}

Hide in-text cites 

/* Hide in-text cites */
.reference {
  display: none;
}

Larger, bolder in-text citations 

/* Larger, bolder in-text citations */
p sup.reference a {
  font-weight: bold;
  font-size: 140% !important;
  color: #55C !important;
  background: #FFF !important;
}
hover sup.reference a {
  background: #FFFF00 !important;
  color: #1010FF !important;
}
hover sup.reference a:visited {
  color: #5A3696 !important;
}
hover sup.reference a:active {
  color: #FAA700 !important;
  background: #0808F8 !important;
}

Inconspicuous in-text citations

The :before and :after pseudo-elements are not supported by IE6 and IE7 

/* inconspicuous in-text citations */
sup.reference {
  white-space: nowrap;
}
sup.reference a {
  font-size: 0.85em;
  font-weight: lighter
}
sup.reference:after {
  content: ' '; /* non-break space after cites */
  text-decoration: none;
}
sup.reference a span {
  display: none; /* hide the brackets */
}
p sup.reference a,
tr sup.reference a,
caption sup.reference a,
ol sup.reference a,
ul sup.reference a,
dl sup.reference a {
  color: black;
}
p:hover sup.reference a,
tr:hover sup.reference a,
caption:hover sup.reference a,
ol:hover sup.reference a,
ul:hover sup.reference a,
dl:hover sup.reference a {
  color: rgb(0, 43, 184);
  text-decoration: underline;
}
p:hover sup.reference a:visited,
tr:hover sup.reference a:visited,
caption:hover sup.reference a:visited,
ol:hover sup.reference a:visited,
ul:hover sup.reference a:visited,
dl:hover sup.reference a:visited {
  color: #5A3696;
}
p:hover sup.reference a:hover,
tr:hover sup.reference a:hover,
caption:hover sup.reference a:hover,
ol:hover sup.reference a:hover,
ul:hover sup.reference a:hover,
dl:hover sup.reference a:hover {
  color: #002BB8;
}
p:hover sup.reference a:active,
tr:hover sup.reference a:active,
caption:hover sup.reference a:active
ol:hover sup.reference a:active,
ul:hover sup.reference a:active,
dl:hover sup.reference a:active {
  color: #FAA700;
}

Pop-ups[edit]

To add pop-ups for the in-text citation that show the full citation, see User:Blue-Haired Lawyer/Footnote popups.

Also, the Gadget at Special:Preferences#mw-prefsection-gadgets->Browsing->Reference Tooltips.

Error messages[edit]

Show citation errors in all namespaces

By default error messages only show for article, user, template, category, help and file pages. Errors do not show on talk, Wikipedia, MediaWiki, portal and book unless enabled: 

/*show cite errors on all pages*/
.mw-parser-output span.brokenref {
  display: inline;
}

Show non-fatal errors

Additionally, in the Article namespace citation templates suppress non-fatal errors by default. These messages can be made visible using:

.mw-parser-output span.cs1-hidden-error { display: inline; }
Category