asp.net - HTML5 Required validation not showing -



asp.net - HTML5 Required validation not showing -

i know there lot of questions none of answers solve problem.

i trying implement required validation built html5, when press submit button , leave field blank nil happens.

my html:

<asp:content id="bodycontent" runat="server" contentplaceholderid="maincontent"> <form action="" method="post"> <div> <div style="margin-right:230px;float:right;"> <div style="padding-left: 10px; font-size: 13px; padding-top: 30px; font-weight: bold; color: black"> <asp:label id="label8" runat="server" text="caller number"></asp:label></div> <div id="div3" tabindex="1" class="ui-widget"> <input required="required" style="width: 180px;margin-left:8px;" id="txtcallernumber" type="text" /> </div> </div> </div> <button type="submit" id="btnsave" style="margin:30px;width:70px;">save</button> </form> </asp:content>

i have tried calling submitform() on form submit event

i developing ie11

asp.net html5

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