add emu-const element/css for ECMA262 "sync" constant

Author: bathos

index.bs

@@ -255,6 +255,9 @@ urlPrefix: https://tc39.github.io/ecma262/; spec: ECMA-262
             border-bottom-color: #9D937D;
         }
 
+        emu-const {
+            font-family: sans-serif;
+        }
 
         emu-val {
             font-weight: bold;
@@ -7635,7 +7638,7 @@ ECMAScript Array values.
     given an iterable |iterable| and an iterator getter |method|,
     perform the following steps:
 
-    1.  Let |iter| be [=?=] <a abstract-op>GetIterator</a>(|iterable|, sync, |method|).
+    1.  Let |iter| be [=?=] <a abstract-op>GetIterator</a>(|iterable|, <emu-const>sync</emu-const>, |method|).
     1.  Initialize |i| to be 0.
     1.  Repeat
         1.  Let |next| be [=?=] <a abstract-op>IteratorStep</a>(|iter|).