Scath questions

Scath answers

• The arrow function does not work when I put it inside the object, the result after call is NaN [duplicate]
• Javascript checkbox sum
• Vertically align content within CSS Grid [duplicate]
• Auto scrolling text inside html table
• How to get the "Leave site? Changes that you made may not be saved" when trying to close a window with a populated form
• CSS: How to hide file input but keep the filename?
• Form re-submitting in Edge browser