Mozilla Bug 291082
  
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    select onkeydown="event.preventDefault();"
    
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    select onkeypress="event.preventDefault();"
    
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    li onkeydown="event.preventDefault();"
    
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    li onkeypress="event.preventDefault();"
    
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    select.addEventListener("keydown", function(event) { event.preventDefault(); });
    
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    select.addEventListener("keypress", function(event) { event.preventDefault(); });