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You can create own content, like new controls, for SAPUI5. If you want to contribute to SAPUI5, you have to consider our guidelines and recommendations with regard to, for example, product standards, file names and encoding.

As a control developer, you create or modify UI libraries and their pieces, i.e. controls and types. You define the set of properties your control provides as well as events or aggregations. A major task is the implementation of a control-specific renderer, which knows how to create suitable HTML markup for a given control instance, taking its current state into account. A renderer is written in JavaScript and produces HTML output which is styled by means of CSS. Such style sheets are another important part of a UI library.