К сожалению, не поддерживается почти ничего:
https://www.photo.gallery/documentation/cssreference/
font-family – A comma-separated list of fonts to use, in descending order of desirability. Any font family name can be used.
font-size – Only the numeric part of the value is used; units (px, pt) are not parsed; pixels and points are equivalent.
font-weight – Recognized values are normal and bold.
font-style – Recognized values are normal and italic.
color – Only hexadecimal color values are supported. Named colors (like blue) are not supported.
text-decoration – Recognized values are none and underline.
text-align – Recognized values are left, center, and right. Only works for full paragraphs.
margin-left – Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
margin-right – Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
text-indent – Only the numeric part of the value is used. Units (px, pt) are not parsed; pixels and points are equivalent.
display – Supported values are inline, block, and none.
kerning – Recognized values are true and false.
leading – Space after end of line