11. The system of claim 8 , wherein the request to modify the second element of the electronic document originates from a Javascript script.
8. A system, comprising: a processor configured to: parse an electronic document, wherein the electronic document is an HTML document; determine whether a first element of the electronic document specifies immutability of a second element of the electronic document; in response to determining that the first element of the electronic document specifies immutability of the second element of the electronic document, set an immutability indicator associated with the second element of the electronic document; automatically set the immutability indicator associated with the second element of the electronic document in response to an event, wherein the event comprises one of a) a passage of a predetermined amount of time since the second element was created, or b) issuance of a predetermined number of modification sequence numbers; receive a request to modify the second element of the electronic document; determine that the immutability indicator associated with the second element of the electronic document is set; and responsive to determining that the immutability indicator associated with the second element of the electronic document is set, prevent the second element of the electronic document from being modified; and a memory coupled with the processor, wherein the memory provides instructions to the processor.