FontIcon versus TextBlock (with only an icon code as content)

[Jay-o-Way]

Sometimes I see FontIcon used, and sometimes I see a TextBlock where the only content is an icon code. Technically these both work fine, but I have a feeling the FontIcon should be used in any/all of these cases. Is there an official rule guideline from Microsoft about this?

And if so, we could convert this (item) into an actionable issue, right? I mean, since this applies to the code in this repo just aswel.

[codendone]

FontIcon exists for use in places which require an IconElement, such as for AppBarButton.Icon or MenuFlyoutItem.Icon. It is fine to use FontIcon elsewhere, but internally it just uses a TextBlock which would be fine to use directly in places which don't require an IconElement.