10. One or more computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: receiving a request to input a character into a text field; at least partly in response to the receiving of the request, causing display of the character within the text field; receiving an instruction to mask a subsequent character requested to be input into the text field; receiving a request to input a subsequent character into the text field; and at least partly in response to the receiving of the request to input the subsequent character, masking the subsequent character within the text field.
10. One or more computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: receiving a request to input a character into a text field; at least partly in response to the receiving of the request, causing display of the character within the text field; receiving an instruction to mask a subsequent character requested to be input into the text field; receiving a request to input a subsequent character into the text field; and at least partly in response to the receiving of the request to input the subsequent character, masking the subsequent character within the text field. 11. One or more computer-readable media recited in claim 10 , wherein the masking of the subsequent character within the text field comprises storing a value of the subsequent character in a hidden field and causing display of a character other than the subsequent character within the text field.