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  HTML5 and Accessibility

Accessibility for people with disabilities is a legal responsibility in many countries. It's also the right thing to do, and one of the characteristics distinguishing professional developers from the WWWs: WYSIWYG-wielding wannabes. But for many, accessibility has been a somewhat black art, requiring adding extra stuff to your code like alt text, table summaries, ARIA information that can be difficult to test by developers who are not assistive technology users themselves.The arrival of HTML5 ha...

   HTML5,Accessibility,Video,Music,Canvas     2011-08-19 08:13:44

  C Macro Tips and Tricks

Preprocessor vs Compiler To properly understand C macros, you must understand how a C program is compiled. In particular, you must understand the different things that happen in the preprocessor and in the compiler. The preprocessor runs first, as the name implies. It performs some simple textual manipulations, such as: Stripping comments. Resolving #include directives and replacing them with the contents of the included file. Evaluating #if and #ifdef directives. Evaluating #defin...

   C,Macro,Preprocessor,Trick     2012-05-01 06:49:05

  Valid JavaScript variable names

Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved words The ECMAScript 5.1 spec says: An Identifier is an IdentifierName that is not a ReservedWord. The spec describes four groups of reserved words: keywords, future reserved words, null literals and boolean lite...

   JavaScript,Name convention,Standard     2012-02-22 05:16:53

  Create Packed Indexes with MySQL

I am pretty much sure that you are aware of indexes which we are creating on database fields. Indexes are very useful to make your query search faster and improve the site performance. But the fact is that Indexes which we are creating on database tables also require some additional space on your hard disk and if you have not properly created these indexes than some t...

   MySQL,Compressed index,PACK_KEYS     2012-04-24 07:42:18

  Native Audio with HTML5

Once upon a time, audio on the web lived primarily in the world of third-party browser plug-ins like Flash, QuickTime and Silverlight. This was not a bad world, but it had its issues.For one, most plug-ins require the user to install them, but not all users are willing (or able) to install them. Also, many players built with these plug-ins are inaccessible, making it difficult for folks who use assistive technologies to access the audio or alternative content.Then there are the front-end design ...

   Audio,HTML5,Built in,Audio tag,Video     2011-10-13 13:04:07

  The trap of the performance sweet spot

This post is about JavaScript performance but I would like to start it by telling a story that might seem unrelated to JS. Please bear with me if you don’t like C.A story of a C programmer writing JavaScriptMr. C. is a C programmer as you can probably guess from his name. Today he was asked by his boss to write a very simple function: given an array of numbered 2d points calculate vector sum of all even numbered points... He opens his favorite text editor and quickly types somet...

   C,JavaScript,Sweet spot,Memory,Low level,Trap     2011-11-06 14:45:01

  Simple but Interesting Features of VS2010 and C# 4.0

IntroductionVS 2010 and C# 4.0 introduced so many new features. Here in this article, I try to cover some very simple, yet very useful features of both.1. Hiding the Selected Part of CodeMany a times, a situation arises when we want to hide a specified piece of code rather that hiding the entire region. This has become easier in VS 2010. Just select the part of the code that you want to hide and right click selectOutlining -> Hide Selection.Same way like a region code also gets collapsible an...

   VS2010,C#4.0,New feature,Walk through     2011-11-18 08:59:29

  Reproduce "MySQL server has gone away" in PHP

If you want to debug the issue of "MySQL server has gone away", you can reproduce it with below steps: Modify configuration file: sudo vi /etc/mysql/my.cnf  Make below changes: [mysqld]   wait_timeout = 30   interactive_timeout = 30  Restart the service: sudo /etc/init.d/mysql restart  Write below PHP codes: $link = mysql_connect('127.0.0.1', 'root', 'root');   if (!$link)&nbs...

   MySQL,debug,rMySQL server has gone away     2013-04-15 11:33:14

  How to undo git changes?

When using git for version control, there is frequent need on undoing commits due to some unexpected changes. This post will introduce how to undo changes with git command in different cases. Undo commit A common undo case is that some commit needs to be reverted as the commit contains error. In this case, the code is already committed. The command to revert the commit is git revert HEAD This command will add new a commit to the existing head to undo the previous commit. It will not change the p...

   GIT,GIT RESET,GIT REVERT,GIT CHECKOUT     2019-12-28 02:21:47

  What is goroutine?

Casual Talk Golang is quite enjoyable to write, aside from the tedious if err != nil checks. One of the fundamental reasons for the joy is goroutine, a core feature of Golang. Understanding goroutines in detail is worthwhile, as they contribute significantly to the pleasure of working with Golang. So, let's talk about goroutines, hoping to provide some insights to the readers. TL;DR: We'll start by talking about assembling a computer, then delve into some concepts of the operating system, such ...

   EXPLANATION,GOLANG,GOROUTINE     2024-01-21 03:26:10

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