rting version <code>2.0.0-beta.12</code> the previous and deprecated implementation of font-size is exposed under a flag that can be configured (<code>:--deprecated-font-size</code>) and is <code>[style*="readium-deprecatedFontSize-on"]</code> by default. This can be used if you need some time to switch to the new implementation, or simply prefer to use the old one. The font-size normalize is no longer applied by default though, and is relying on another flag (<code>:--fs-normalize</code>) with <code>[style