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Built-in CSS Selectors

When Oxygen XML Author Eclipse plugin renders content in the Author mode, it adds built-in CSS selectors (in addition to the CSS stylesheets linked in the XML or specified in the document type associated to the XML document). These built-in CSS selectors are processed before all other CSS content, but they can be overwritten if the CSS developer wants to modify a default behavior.

List of CSS Selector Contributed by Oxygen XML Author Eclipse plugin

@namespace oxy "http://www.oxygenxml.com/extensions/author";
@namespace xi "http://www.w3.org/2001/XInclude";
@namespace xlink "http://www.w3.org/1999/xlink";
@namespace svg "http://www.w3.org/2000/svg";
@namespace mml "http://www.w3.org/1998/Math/MathML";

oxy|document {
    display:block !important;
}

oxy|cdata {
    display:-oxy-morph !important;
    white-space:pre-wrap !important;
    border-width:0px !important;
    margin:0px !important;
    padding: 0px !important;
}

oxy|processing-instruction {
    display:-oxy-morph !important;
    color: rgb(139, 38, 201) !important;
    white-space:pre-wrap !important;
    border-width:0px !important;
    margin:0px !important;
    padding: 0px !important;
}

/*EXM-33415 Avoid showing other editors PIs in content, not
useful when editing in Oxygen*/
oxy|processing-instruction[Pub],
oxy|processing-instruction[PubTbl],
oxy|processing-instruction[xm-replace_text],
oxy|processing-instruction[xm-deletion_mark],
oxy|processing-instruction[xm-insertion_mark_start],
oxy|processing-instruction[xm-insertion_mark_end],
oxy|processing-instruction[xml-model],
oxy|processing-instruction[xml-stylesheet],
oxy|processing-instruction[fontoxml-text-placeholder]
{
    display:none !important;
}

oxy|comment {
    display:-oxy-morph !important;
    background-color:#f7f7f7;
    color: #707070 !important;
    white-space:pre-wrap !important;
    border-width:0px !important;
    margin:0px !important;
    padding: 0px !important;
}

oxy|reference:before,
oxy|entity[href]:before{  
  -oxy-link: attr(href) !important;
  text-decoration: underline !important;
  color: navy !important;
  
  margin: 2px !important;
  padding: 0px !important;
  margin-right:0px !important;
  padding-right:2px !important;  
}

oxy|reference:before {
  display: -oxy-morph !important;
  content: url(../images/EditContent16.png) !important;  
}

oxy|entity[href]:before{
  display: -oxy-morph !important;
  content: url(../images/EditContent16.png) !important;
}

oxy|reference,
oxy|entity {
    -oxy-editable:false !important;
    background-color: rgb(240, 240, 240) !important;
    margin:0px !important;
    padding: 0px !important;
    
}

oxy|reference[editable='true'] {
    -oxy-editable:true !important;
}

oxy|reference {
    display:-oxy-morph !important;
    /*EXM-28674 No need to present tags for these artificial references.*/
    -oxy-display-tags: none;
}

/*EXM-16109 Support for expand references on demand*/
*:-oxy-lazy-expand-ref:not(:-oxy-ref-expanded):before(2000) {
  content: oxy_button(transparent, true, enableInReadOnlyContext, true, action, oxy_action(
          name, '${i18n(Expand_reference)}', 
          icon, url('/images/ExpandRef.png'), 
          operation, 'SetPseudoClassOperation', 
          arg-name, '-oxy-ref-expanded'
));  
}
*:-oxy-lazy-expand-ref:not(:-oxy-ref-expanded) {
    -oxy-foldable:false;
    -oxy-placeholder-content:"";
}

oxy|entity {
    display:-oxy-morph !important;
}

oxy|entity[name='amp'],
oxy|entity[name='lt'],
oxy|entity[name='gt'],
oxy|entity[name='quot'],
oxy|entity[name='apos']{
    /*EXM-32236, EXM-37026 Do not present tags for simple character entity references.*/
    -oxy-display-tags: none;
}

oxy|entity[href] {
  border: 1px solid rgb(175, 175, 175) !important;
  padding: 0.2em !important;
}
/*Wraps multiple fallback elements*/
oxy|include-wrapper {
    display:-oxy-morph !important;
}

xi|include {
    display:-oxy-morph !important;
    margin-bottom: 0.5em !important;
    padding: 2px !important;
}
xi|include:before,
xi|include:after{
    display:inline !important;
    background-color:inherit !important;
    color:#444444 !important;
    font-weight:bold !important;
}

xi|include:before {
    content:url(../images/link.png) attr(href)  !important;
    -oxy-link: attr(href) !important;
}
xi|include[parse="text"]:before {
    content:url(../images/link.png) !important;
}
xi|include[xpointer]:before {
    content:url(../images/link.png) attr(href) " " attr(xpointer) !important;
    -oxy-link: oxy_concat(attr(href), "#", attr(xpointer)) !important;
}

xi|fallback {
    display:-oxy-morph !important;
    margin: 2px !important;
    border: 1px solid #CB0039 !important;
}

xi|fallback:before {
    display:-oxy-morph !important;
    content:"XInclude fallback: " !important;
    color:#CB0039 !important;
}

oxy|doctype {
    display:block !important;
    background-color: transparent !important;
    color:blue !important;
    border-width:0px !important;
    margin:0px !important;
    padding: 2px !important;
}

@media oxygen-high-contrast-black, oxygen-dark-theme{
    oxy|doctype {
        color:#D0E2F4 !important;
    }
}

oxy|error {
    display:-oxy-morph !important;
    -oxy-editable:false !important;
    white-space:pre !important;
    font-weight:bold !important;
    color: rgb(178, 0, 0) !important;
    -oxy-display-tags: none;
}

oxy|error:before {
    content:url(../images/ReferenceError12.png) "[" !important;
    color: rgb(178, 0, 0) !important;
}
oxy|error[level='warn']:before {
    content:url(../images/ReferenceWarn12.png) "[" !important;
    color: rgb(200, 185, 0) !important;
}

oxy|error[level='warn'] {
    color: rgb(200, 185, 0) !important;
}

oxy|error:after {
    content:"]" !important;
}


*[xlink|href]:before {
    content:url(../images/link.png);
    -oxy-link: attr(xlink|href) !important;
}


/*No direct display of the MathML and SVG images.*/
svg|svg{
    display:inline !important;
    white-space: -oxy-trim-when-ws-only !important;
}
/*EXM-28827 SVG can contain more than one namespace in it*/
svg|svg * {
    display:none !important;
    white-space:normal !important;
}

mml|math{
    display:inline !important;
    white-space: -oxy-trim-when-ws-only !important;
}
mml|math mml|*{
    display:none !important;
    white-space: normal !important;
}

/*Text direction attributes*/
*[dir='rtl'] { direction:rtl; unicode-bidi:embed; }
*[dir='rlo'] { direction:rtl; unicode-bidi:bidi-override; }

*[dir='ltr'] { direction:ltr; unicode-bidi:embed; }
*[dir='lro'] { direction:ltr; unicode-bidi:bidi-override; }

@media oxygen-high-contrast-black, oxygen-dark-theme{
    xi|include:before,
    xi|include:after{
        color:#808080 !important;
    }
}

/* 
 * EXM-40349
 * 
 * In DIFF these place holder PIs are not handled so we treat them as normal PIs with a bit of styling.
 * 
 */
oxy|processing-instruction[oxy-placeholder] {
    visibility:-oxy-collapse-text;
    -oxy-display-tags:none;
}

oxy|processing-instruction[oxy-placeholder]:before {
    background-color: rgba(192, 192, 192, 0.2) !important;
    color: rgba(0, 0, 0, 0.6) !important;
    font-weight:bold;
    /* When there isn't an associated CSS the NO_CSS rules hide the PIs. @see AuthorViewport.CSS_ERROR_END */
    display:-oxy-morph;
    content: attr(content) !important;  
}

@media oxygen-high-contrast-black, oxygen-dark-theme{
   oxy|processing-instruction[oxy-placeholder]:before {
    background-color: rgba(0, 0, 0, 0.15) !important;
    color: rgb(156, 156, 156) !important;
    }
    /* ====================================
    *
    * built-in oXygen elements
    * 
    */
    oxy|comment {
        color: #a2a2a2 !important;
        background-color: transparent !important;
    }
    oxy|reference,
    oxy|entity {
        background-color: rgb(100, 100, 100) !important;
    }
}

Example:

To show all entities in the Author mode as transparent, without a gray background, first define in your CSS after all imports the namespace:

@namespace oxy "http://www.oxygenxml.com/extensions/author";

and then add the following selector:

oxy|entity {
    background-color: inherit !important;
}