The Flexbox Layout (Flexible Box) module (a W3C Candidate Recommendation as of October 2017) aims at providing a more efficient way to lay out, align and distribute space among items in a container, even when their size is unknown and/or dynamic (thus the word flex).. Of course I've added a new method and refined the CSS declarations. The code that jQuery uses to show and hide elements has been updated to focus on inline rather than computed styles, respecting stylesheet display values whenever possible for increased compatibility with responsive design techniques (in which active stylesheet rules can dynamically change upon device reorientation/window resize/etc. New: Animated Menu Toggle Block; Fix: Unable to change the number of columns on a newly added menu items within the Mega Menu Standard Layout sub menu builder Follow answered Aug 29, 2013 at 20:32. In the above code, the form is created for the addition of two numbers. Custom properties are ordinary properties, so they can be declared on any element, are resolved with the normal inheritance and cascade rules, can be made conditional with @media and other conditional rules, can be used in HTMLs Follow answered Aug 29, 2013 at 20:32. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. An