The special function characters such as FNC1 through FNC4 belong to the class of “non-data characters” that can be encoded within various barcode symbologies but with do not have any direct ASCII representation in the decoded data stream. Each symbology that supports such characters has a different scheme for encoding them in its internal representation … Read more
It is possible to increase the specificity of a selector using type selectors, but not conventionally. The reason for this is explained below, but for those who are simply looking for an alternative, there are two of these. You can either chain :not() pseudo-classes containing type selectors in a single compound selector: h1 {} /* … Read more
It is useful when you want to size something in relation to the height of your text’s lowercase letters. For example, imagine working on a design like so: In the typographic dimension of design, the height of letters has important spatial relationships to the rest of the elements. The lines in the source image above … Read more
Basically, it’s a broken interface. Ken Arnold and Bill Venners discussed it in Java Design Issues. Arnold: If I were to be God at this point, and many people are probably glad I am not, I would say deprecate Cloneable and have a Copyable, because Cloneable has problems. Besides the fact that it’s misspelled, Cloneable … Read more
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 will browsers treat as a valid attribute … Read more
This syntax is called Object Initialization. C# specification clearly gives a lot of examples on this subject: 7.6.10.2 Object initializers An object initializer consists of a sequence of member initializers, enclosed by { and } tokens and separated by commas. Each member initializer must name an accessible field or property of the object being initialized, … Read more
Reserved keywords cannot be used as identifiers (variable names). Unlike most other special Javascript words (like those listed in the question, let, finally, …), await is not a reserved keyword, so using it as a variable name does not throw a SyntaxError. Why wasn’t it made into a reserved keyword when the new syntax came … Read more
There are two methods defined in specifications, createDocument from DOM Core Level 2 and createHTMLDocument from HTML5. The former creates an XML document (including XHTML), the latter creates a HTML document. Both reside, as functions, on the DOMImplementation interface. var impl = document.implementation, xmlDoc = impl.createDocument(namespaceURI, qualifiedNameStr, documentType), htmlDoc = impl.createHTMLDocument(title); In reality, these methods … Read more
There are specific suffixes for long (e.g. 39832L), float (e.g. 2.4f) and double (e.g. -7.832d). If there is no suffix, and it is an integral type (e.g. 5623), it is assumed to be an int. If it is not an integral type (e.g. 3.14159), it is assumed to be a double. In all other cases … Read more
The definition of UNIX timestamp is time zone independent. The UNIX timestamp is the number of seconds (or milliseconds) elapsed since an absolute point in time, midnight of Jan 1 1970 in UTC time. (UTC is Greenwich Mean Time without Daylight Savings time adjustments.) Regardless of your time zone, the UNIX timestamp represents a moment … Read more