Single tag method for webpage personal customization

A method of providing dynamic, personal web content, comprising:

• operating a web server computer to deliver one or more webpages, wherein each of the one or more webpages includes a same single code snippet, in addition to displayable webpage content, wherein the same single code snippet is the same on all of the one or more webpages and does not identify any specific promotion, and wherein the same single code snippet is not associated with any specific advertising region within the displayable webpage content;
• receiving, at a promotion server computer, a request for promotions from execution of the same single code snippet within a web browser of a visiting client accessing a webpage in the one or more webpages;
• determining, by the promotion server computer, if the visiting client, contents of the webpage, and time of visit match a promotion configured to generate specific dynamic content for a visitor meeting defined criteria during an identified period displayable on identified webpages or identified webpage elements;
• transmitting one or more determined promotions from the promotion server computer to the visiting client web browser for execution within the web browser to dynamically modify the webpage;
• and
• executing, by the web browser while rendering the webpage during the webpage access, code contained in the determined promotions and adding to, modifying, or deleting from the displayable webpage content, wherein said code has access to add, modify, or delete any element within a document object model of the webpage.