Word meaning appearance of a word on a page? (emboldened, italicised etc.)

Typography

art and technique of arranging type in order to make language visible (wikipedia)

The appearance of a font is its style.

From Wikipedia:

Each style may still be in a separate "font file"—for instance, the typeface "Bulmer" may include the fonts "Bulmer roman", "Bulmer italic", "Bulmer bold" and "Bulmer extended"...

From W3C:

The font-style property selects between normal, italic and oblique faces within a font family.

The word you are looking for is: typeface

Each font of a typeface has a specific weight, style, condensation, width, slant, italicization, ornamentation, and designer or foundry (and formerly size, in metal fonts) [...] There are thousands of different typefaces in existence, with new ones being developed constantly.

The art and craft of designing typefaces is called type design. [...]The distinction between font and typeface is that a font designates a specific member of a type family such as roman, boldface, or italic type, while typeface designates a consistent visual appearance or style which can be a "family" or related set of fonts. For example, a given typeface such as Arial may include roman, bold, and italic fonts.