upd attribute preload keys

CHANGELOG.md

@@ -10,6 +10,9 @@
 | ```<<"dir">>``` | ```ltr``` | ```"ltr"``` |
 | ```<<"dir">>``` | ```rtl``` | ```"rtl"``` |
 | ```<<"dir">>``` | ```auto``` | ```"auto"``` |
+| ```<<"preload">>``` | ```auto``` | ```"auto"``` |
+| ```<<"preload">>``` | ```none``` | ```"none"``` |
+| ```<<"preload">>``` | ```metadata``` | ```"metadata"``` |
 
 
 ##### 6.6.2-erl19
@@ -31,6 +34,7 @@
 * mv work with cookies to n2o (n4u)  
 * mv q/1,2 and qc/1,2 to n2o (n4u)  
 
+
 ##### 6.6.1-erl19
 * update to 6.6.1 tag by [@5HT Maksym Sokhatskyi/Namdak Tönpa](https://github.com/5HT)  
 * with code formatting etc  

src/elements/embed/element_audio.erl

@@ -92,9 +92,9 @@ render_element(Record) ->
     
     {<<"preload">>,
        case Record#audio.preload of
-         "auto" -> "auto";
-         "none" -> "none";
-         "metadata" -> "metadata";
+         auto -> "auto";
+         none -> "none";
+         metadata -> "metadata";
          _ -> []
        end},
     

src/elements/embed/element_video.erl

@@ -94,9 +94,9 @@ render_element(Record) ->
     {<<"poster">>, Record#video.poster},
     {<<"preload">>,
        case Record#video.preload of
-         "auto" -> "auto";
-         "none" -> "none";
-         "metadata" -> "metadata";
+         auto -> "auto";
+         none -> "none";
+         metadata -> "metadata";
          _ -> []
        end},