When a <select> element has a value attribute, if one of the <option>s matches that value, it
will display as selected. Due to browser quirks, this value must be set after options
have been added. Since set_content returns its target element, the value can be set
afterward by chaining:
set_content(DOM("#selectelem"), [OPTION(...), OPTION(...)]).value = some_val;
Take advantage of a quick conversion tool to do the bulk of the work. Some formatting may want to be adjusted, and the necessary imports will need to be added (eg using autoimport), but the majority of the translation should work correctly.
Suitable for HTML snippets, SVG images, and probably most other XML documents.