function postProcess( html ) {
	html = replace( html, RE_VIEW_BOX, 'viewBox$2' );
	html = replace( html, RE_CLIP_PATH_OPEN, '<clipPath$2' );
	html = replace( html, RE_CLIP_PATH_CLOSE, '</clipPath>' );
	return html;
}
Applies post-processing to output HTML.

## Notes

-   The need for this function stems from rehype and how it treats foreign namespaces in HTML. For background, see the following issues:

    -   <https://github.com/rhysd/rehype-react/issues/5>
    -   <https://github.com/wooorm/rehype/issues/2>
    -   <https://github.com/syntax-tree/hast/issues/6>

-   **WARNING**: this function is ad-hoc, undoubtedly not comprehensive, and will inevitably have to be updated as additional issues arise.

@private
@param {string} html - HTML to process
@returns {string} output HTML