specifications

(Not to be confused with Xunit , a popular .Net unit testing library.) Today in a fit of boredom I started inspecting Gmails DOM (yes, I was very bored). Everything looked pretty straightforward until I noticed an interesting specification on the widths of certain elements. The illustrious Googlites had specified a number of table cols using the rare 'ex' unit. width: 22ex; At first I was stumped ("what's an 'ex'?"), then it came back to me: I seem to remember something from years ago when first I was learning about CSS. From the CSS3 spec : [The ex unit is] equal to the used x-height of the

Resharper has just suggested the following refactoring to me: // Constructor initializes InitializedProperty but // the UninitializedSubproperty is uninitialized. var myInstance = new MyClass(); myInstance.InitializedProperty.UninitializedSubproperty = new MyOtherClass(); // becomes var myInstance = new MyClass { InitializedProperty = { UninitializedSubproperty = new MyOtherClass() } }; I've never seen this kind of object initialization before. In particular I don't see how InitializedProperty = { UninitializedSubproperty = new MyOtherClass() } makes any sense - it's not assigning anything to

What are the largest valid px values that CSS width and height properties accept? (I'm currently building a webapp that creates a very large zoomable container element and I want to know what are the actual limits.) Using the CSS inspector that comes with certain browsers on an element with 10000000000px width and height : Firefox: 33554400px Chrome: 33554428px Opera: 33554428px IE 9: 21474836.47px 来源： https://stackoverflow.com/questions/16637530/whats-the-maximum-pixel-value-of-css-width-and-height-properties

In HTML attribute name=value pairs, what are the characters allowed for the 'name' portion? ..... Looking at some common attributes it appears that only letters (a-z and A-Z) are used, but what other chars could be allowed as well?... maybe digits (0-9), hyphens (-), and periods (.) ... is there any spec for this? Alohci It depends what you mean by "allowed". Each tag has a fixed list of attribute names which are valid, and in html they are case insensitive. In one important sense, only these characters in the correct sequence are "allowed". Another way of looking at it, is what characters

This question already has an answer here: What are the rules for JavaScript's automatic semicolon insertion (ASI)? 5 answers As you might know, ECMAscript tries to be smart and will automatically insert semicolons if you didn't write those explicitly. Simple example function foo() { var bar = 5 return bar } will still work as expected. But there are some caveats if you rely on that. If we re-write that function like so function foo() { var bar = 5 return { bar: bar } } ..that function would now return undefined because the interpreter would insert that semicolon right after the return