How to cancel the background color of the a tag when it is clicked in H5

a {
 -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
 -webkit-user-select: none;
 -moz-user-focus: none;
    -moz-user-select: none;
}

a,a:hover,a:active,a:visited,a:link,a:focus{
    -webkit-tap-highlight-color:rgba(0,0,0,0);
    -webkit-tap-highlight-color: transparent;
    outline:none;
    background: none;
    text-decoration: none;
}

::selection { 
    background: #FFF; 
    color: #333; 
} 
::-moz-selection { 
    background: #FFF; 
    color: #333; 
} 
::-webkit-selection { 
    background: #FFF; 
    color: #333; 
}

-webkit-tap-highlight-color:rgba(0,0,0,0);

img {
 -webkit-tap-highlight-color:rgba(0,0,0,0);
 -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
 -webkit-user-select: none;
 -moz-user-focus: none;
 -moz-user-select: none;
 user-select: none;
}