Font awesome icon DisAppear in Internet Explorer and Mozila

Question

hi,

 

      i have used Font awsome icon in my page it has been working fine for Chrome only but IE and Mozila is not appear i dont know why can you please share your solution if you are Facing this issuse

 

 

<asp:LinkButton runat="server" ID="btnRun" ToolTip="Large String" OnClick="btnRun_Click" Text="<i class='fa fa-pencil-square-o' aria-hidden='true' style='font-size: 24px;color:black'></i>"