Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
I have mostly tested trafilatura on a set of English, German and French web pages I had run into by surfing or during web crawls. There are definitely further web pages and cases in other languages for which the extraction doesn't work so far.
Corresponding bug reports can either be filed as a list in an issue like this one or in the code as XPath expressions in [xpaths.py](https://github.com
APCA (Accessible Perceptual Contrast Algorithm) is a new method for predicting contrast for use in emerging web standards (WCAG 3) for determining readability contrast. APCA is derived form the SAPC (S-LUV Advanced Predictive Color) which is an accessibility-oriented color appearance model designed for self-illuminated displays.
Check out https://github.com/ipeirotis/ReadabilityMetrics for some information