MediaWiki:Gadget-i18n-selector-highlighting.css

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.mw-content-ltr {
 color: blue;
 border: 1px solid blue;
 background: lightBlue;
}
.mw-content-rtl {
 color: green;
 border: 1px solid green;
 background: lightGreen;
}
.mw-content-ltr,
.mw-content-rtl {
 margin-left: 1em;
 padding: 0.5em;
}

.mw-content-ltr ul {
  border-left: 5px solid pink; border-right: none;
}
.mw-content-rtl ul {
  border-right: 5px solid pink; border-left: none;
}

.mw-gadget-i18nselectors-hideme {
 display: none;
}