feat: README pseudo elements

README.md

@@ -75,7 +75,9 @@ You need to use a custom CSS template, like below to map your audio or MIDI even
 
 You can extend parameter by heritage with template `[<parameter> <type> <option> <audio or midi control>]`. This is not mandatory to type all heritage, but you need to restect the direction. This is allowed : `[<parameter> <type> <option>]` or `[<parameter> <type>]`. This is **not** allowed : `[<parameter> <audio or midi control>]`.
 
-You can use without CSSLSD code without any parameters, use same template like above. How to use : `[<type> <option> <audio or midi control>]`. 
+You can use without CSSLSD code without any parameters, use same template like above. How to use : `[<type> <option> <audio or midi control>]`.
+
+Pseudo elements like `::after` or `::before` are working, if element have already a pseudo element add your CSS LSD template otherwise add pure CSS, it will create the pseudo element by adding style with class `CSSLSD` at the end of the document. For this pure CSS add : `position:absolute; content:''; width:10px; height:10px;`.
 
 Code example:
 
@@ -86,7 +88,7 @@ body {
     background-color:[couleur #000:#fff];
 }
 h1 {
-  /* Simple parameter usage */
+    /* Simple parameter usage */
     opacity: [opacité];
     font-size:[0:20 d loud];
     color: #000000;