validator errors relating to fonts

[carlangel]

In running an epub of a book through the validator, I've been getting a number of these types of error messages:

"INFO(CSS-007): ./books/Bo/databases/eBookIt/temp_uploads/1589238597.epub/OEBPS/css/idGeneratedStyles_0.css(29,2): Font-face reference OEBPS/font/Baskerville.ttc refers to non-standard font type application/x-font-ttf."

Any idea what this means? Thanks, folks.

[Peter Villevoye]

ePubs require the use of Open Type formats for fonts !

So you need to use fotns with a little "O" behind its name.

Next danger: the font needs to allow packaging in an ePub.

So verify if you have the proper license to do so, otherwise it might give you another warning, that the font will not be included. (BTW,  not getting that warning doesn't mean that you're legally on a safe side – always verify your license...)

[carlangel]

Thanks so much for your reply, Peter. I actually just posted another font-related issue from a validator warning: 

./books/Bo/databases/eBookIt/temp_uploads/1590631189.epub/OEBPS/Styles/idGeneratedStyles.css(36,2): Font-face reference OEBPS/Fonts/Antonio-Bold.ttf refers to non-standard font type application/x-font-ttf."

My first guess was maybe it was a font conflict or incompatibility issue, but the same font (and css) is used throughout the other chapters and they exported fine (no warning messages) so I'm wondering what's going on. The only thing that's different is that this chapter contains a table whose borders I set to 0 in Sigil, but that would be unrelated, right?

[Peter Villevoye]

The font is being referred to in the CSS file (for the whole ePub),

not in the HTML (per chapter), as you can see from the warning: 

[...]idGeneratedStyles.css

Why it hasn't been reported earlier, is unclear to me.

Are you creating/validating a Reflowable or Fixed Layout ePub ?

[carlangel]

Hi Peter, I'm exporting to a reflowable epub.