Parsoid's generated HTML is different from PHP parser, especially for File: links (bug 61786), so wikitext in Flow posts has different appearance and behavior . VE has some CSS and JS to make it appear similar.
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Create 'ext.parsoid.styles' moduleDone, gerrit 124785 , later moved to core 'mediawiki.skinning.content.parsoid' module -
Use it in Flow (bug 60017) and VE (bug 63983) - Parsoid needs to support other File: types beyond images (T64270)
- ? Additional work for operational features -- srcset, TimedMediaHandler integration, etc. (T56844) VE may not need these.