Many developers do not consider web standards while create their webpages/apps. This will create a bad experience for some users that not use that product with a certain OS or application. And nowdays there are way to many configuration available to be sure you use the right one. And a limited memory will narrow your option to have several apps installed only for certain webpages. Some simple example for a bike sharing system, a Michelin rated restaurant from Stockholm or a museum in Krakow - that worked poorly on several browsers will show the importance of compatibility. Best practices for developers will be presented. Best practices for report issues will be exemplified. Already fixed issue will present simple solutions to the audience that unblocked several users.