4.5.1 Using character ranges to define composite fonts. 4.5 Character range: the unicode-range descriptor. 4.4 Font property descriptors: the font-style, font-weight, and font-stretch descriptors. 4.3.2 Loading an individual item in the src descriptor. 4.2 Font family: the font-family descriptor. 3.1 Introduction to Font Rendering Controls. 2.8.4 Controlling synthetic faces: the font-synthesis shorthand. 2.8.3 Controlling synthesized small caps: The font-synthesis-small-caps property. 2.8.2 Controlling synthesized oblique: The font-synthesis-style property. 2.8.1 Controlling synthesized bold: The font-synthesis-weight property. 2.7 Shorthand font property: the font property. 2.6 Relative sizing: the font-size-adjust property. 2.5.1 Absolute Size Keyword Mapping Table. 2.4 Font style: the font-style property. 2.3 Font width: the font-stretch property. 
2.2 Font weight: the font-weight property.
2.1.2 Relationship Between Faces and Families.2.1 Font family: the font-family property.
It means that the WG believes the feature may have difficulty being interoperably implemented in a timely manner, and marking it as such allows the WG to drop the feature if necessary when transitioning to the Proposed Rec stage, without having to publish a new Candidate Rec without the feature first. “At-risk” is a W3C Process term-of-art, and does not necessarily imply that the feature is in danger of being dropped or delayed.
Synthesis of the font-variant-position property. The following features are at-risk, and may be dropped during the CR period:
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