Methods, systems and articles of manufacture for creating an electronic spreadsheet using a web-based spreadsheet application. A web-server hosting a web-based spreadsheet website comprises one or more computer(s) having at least one computer processor, memory, data storage and a network communication device (e.g. a network adapter). The web-server is configured to transmit a spreadsheet web application to a user computing device (e.g. a personal computer, smartphone, etc.) having a web-browser via the internet. The spreadsheet web application is configured to program the web-browser of the computing device to display and execute a spreadsheet web application having various features and functionality, including one or more of a separate design section and preview panel, a test data feature, line by line building of a spreadsheet without a starting grid of rows and columns, an embedded spreadsheet feature, an embedded worksheet display within a line feature, or any combination of these features.