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PromptChar

configuration

Specifies the character used to represent the absence of user input in the widget

promptChar

String

Default: "_"

<input id="maskedtextbox" />
<script>
$("#maskedtextbox").kendoMaskedTextBox({
    mask: "000000",
    promptChar: " " //specify prompt char as empty char
});
</script>

Note that the promptChar should not be equal to any of the used mask literals in the mask value.