@@ -621,9 +621,13 @@ export class Menu {
621621        ) , 
622622        this . a11yVar < string > ( 'highlight' ,  ( value )  =>  this . setHighlight ( value ) ) , 
623623        this . a11yVar < string > ( 'backgroundColor' ) , 
624-         this . a11yVar < string > ( 'backgroundOpacity' ,  ( value )  =>  this . setAlpha ( 'bg' ,  value ) ) , 
624+         this . a11yVar < string > ( 'backgroundOpacity' ,  ( value )  => 
625+           this . setAlpha ( 'bg' ,  value ) 
626+         ) , 
625627        this . a11yVar < string > ( 'foregroundColor' ) , 
626-         this . a11yVar < string > ( 'foregroundOpacity' ,  ( value )  =>  this . setAlpha ( 'fg' ,  value ) ) , 
628+         this . a11yVar < string > ( 'foregroundOpacity' ,  ( value )  => 
629+           this . setAlpha ( 'fg' ,  value ) 
630+         ) , 
627631        this . a11yVar < boolean > ( 'subtitles' ) , 
628632        this . a11yVar < boolean > ( 'viewBraille' ) , 
629633        this . a11yVar < boolean > ( 'voicing' ) , 
@@ -1335,7 +1339,11 @@ export class Menu {
13351339  protected  setAlpha ( type : string ,  value : string )  { 
13361340    if  ( MathJax . _ ?. a11y ?. explorer )  { 
13371341      const  alpha  =  parseInt ( value )  /  100 ; 
1338-       MathJax . _ . a11y . explorer . Region . LiveRegion . setAlpha ( type ,  alpha ,  this . document . document ) ; 
1342+       MathJax . _ . a11y . explorer . Region . LiveRegion . setAlpha ( 
1343+         type , 
1344+         alpha , 
1345+         this . document . document 
1346+       ) ; 
13391347    } 
13401348  } 
13411349
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