CSS-Grid: wie mache ein datei mit Firefox Code and IE 11 Code

[liebewinter]

jetzt habe versuche ohne grid-template-areas die ich Fehler gemacht habe , weil grid-template-areas ist für IE , und an IE schon mit -ms-grid-column: gegeben habe ...

body {
 
  display: -ms-grid;
  display: grid;
  grid-areas:         "header   header   header"
                      "nav      nav      nav"
                      "linkBox  linkBox  linkBox"
                      "main     main     main"
                      "infoBox  infoBox  infoBox"
                      "footer   footer   footer" ;
  
  width: 100%;
  height: 250px;
  grid-gap: 5px;
  -ms-grid-rows:  120px 80px 103px 200px 110px 70px;
  grid-rows:  120px 80px 103px 200px 110px 70px;
  -ms-grid-columns: 9% 73% 17%;
  grid-columns: 100px 400px 200px;


  
  
   
  
     
   background-color: #ebf5d7;
   margin: 5px;
}






body > header {
   
    -ms-grid-column: 1;
    -ms-grid-column-span: 3;
    grid-columns: 1/3;
    -ms-grid-row: 1;
    -ms-grid-row-span: 1;
    grid-rows: 1/3;
    
    
    
    
    background-image: url("/Bilder/f409784856.png");
    
    background-repeat: no-repeat;
    padding: 60px;
       
    
}

body > nav {
    
    -ms-grid-column: 1/3;
    -ms-grid-column-span: 3;
    grid-columns: 1/3;
    -ms-grid-row: 2;
    grid-rows: 1/3;
   
   
    
    background-color: #d2f5c4;
    margin: 5px;
}

body > #externalLinks {
    -ms-grid-column: 1;
    grid-columns: 1; 
    -ms-grid-row: 3;
    -ms-grid-row-span: 3;
    margin: 5px;
    grid-rows: 103px;
    
   
    
   
    background-color:  #d2f3c6;
	
}
body > main {
    -ms-grid-column: 2;
    grid-columns: 2; 
    -ms-grid-row: 3;
    -ms-grid-row-span: 3;
    display: block; 
    margin: 5px;
    grid-rows: 200px;
   
    background-color: #eaf6e5;
}

body > #furtherInformation {
    
    -ms-grid-column: 3;
    -ms-grid-column-span: 3;
    grid-columns: 3; 
    -ms-grid-row: 3;
    -ms-grid-row-span: 3;
    margin: 5px;
    grid-rows: 110px;
    
    
    background-color: #d2f3c6;
    
}

body > footer {
	-ms-grid-column: 1;
	-ms-grid-column-span: 3;
        grid-columns: 1/3; 
        -ms-grid-row: 6;
        -ms-grid-row-span: 6;
        margin: 5px;
        grid-rows: 70px;
        
        background-color: #99ee7a;

}

wie der screenshot zeigt , ist besser geworden , aber nicht 100% ...