Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: Which html layout engine is used by the web browser written by [OpenDocument]?
answer: gecko
answer type: HTML Layout Engine.
auxiliary information: The Open Document Format for Office Applications, also known as OpenDocument, is an XML-based file format for spreadsheets, charts, presentations and word processing documents. It was developed with the aim of providing an open, XML-based file format specification for office applications. The standard was developed by a technical committee in the Organization for the Advancement of Structured Information Standards consortium. It was based on the Sun Microsystems specification for OpenOffice.org XML, the default format for OpenOffice.org, which had been specifically intended "to provide an open standard for office documents." In addition to being an OASIS standard, it was published as an ISO/IEC international standard ISO/IEC 26300 ‚Äî Open Document Format for Office Applications.

The [OpenDocument] web browser uses which html layout engine?