I have been around the internet for over 30 years back when Net Zero was in competition with AOL.
Yahoo was the main search engine in the business. Google was a word we knew as a number.
Random samples of various work in Website Design and Creative Art "Photoshop, pencil, photography"
I have been doing this for 30 years so I am the first one to tell you the rating should be 100%. However I have been doing this for 30 years and simple little things like HTM to HTML to HTML5 change the rating system. Where you see 95% I see 100% but not knowing tomorrow what will show up to use and understand I must rate 95%
Besides all that said I like the fact Bootstrap has a built in graph and rather then say 100% in everything I can show off how we can change the scales :-)