Today I have found a funny example of how to ensure the checkbox is not visible:

<input id="chkIsDirty" type="checkbox" readonly style="DISPLAY: none;
VISIBILITY: hidden; BACKGROUND-COLOR: transparent" size="0" runat="server"
name="chkIsDirty">

I have emphasized the important elements. I wonder if it is also hidden by the style sheets and maybe in the code via the runat="server" attribute

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