TrimSpreadsheet is a lightweight open-source JavaScript spreadsheet engine. It let’s you work with spreadsheet data right in your web browser. The TrimSpreadsheet engine is written as 100% standards-based JavaScript and CSS. Spreadsheets are stored as HTML <table> markup, so it’s easy to understand and embed into your own web pages. Merely assign a class of “spreadsheet” to your <table>, and the TrimSpreadsheet engine will do the rest. Anyone familiar with CSS can also easily create their own spreadsheet themes.