Kompx.com or Compmiscellanea.com

CSS. Target Opera only

Windows : Opera 9.5+ [ 1 ] [ 2 ].

Linux : Opera 9.5+ [ 3 ].

CSS targeting Opera web browser only:

This text is red in Opera

HTML / XHTML. Code:

<p>This text is red in Opera</p>

CSS. Code:

doesnotexist:-o-prefocus, p {color: #f00;}

The -o-prefocus pseudo-class allows styling elements for Opera browser only. The code is placed in the common CSS file, not in a separate one as it is in case of Internet Explorer conditional comments.

Source: http://www.opera.com/docs/specs/presto2.12/css/o-vendor/


[ 1 ]

Opera 3.5 - 5.0 ignores "doesnotexist:-o-prefocus" and reads code as p {color: #f00;}. Opera 6.0 - 9.4 ignores the whole code starting "doesnotexist".

[ 2 ]

Internet Explorer 5.5+, Firefox 1.0+, Google Chrome, Safari 3.1+, SeaMonkey 1.0+, Netscape 7.2+, Mozilla 1.5+ ignore the whole code starting "doesnotexist".

Older browsers like Internet Explorer before 5.5 or Netscape before 7.2 or Mozilla before 1.5 seem to ignore the uncommon, Opera 9.5+ specific code ("doesnotexist:-o-prefocus") and apply styles to what they understand - here it is the p tag; making the text in it red.

[ 3 ]

The text is red in Dillo 3.0.1 as well.


Aliosque subditos et thema


Screenshots in DOS


There are several programs for taking screenshots in DOS. SNARF, for instance. Using this application succeeded in taking screenshots in most of the cases. Also, the screenshots' quality (.BMP files) by SNARF results to be the highest among the programs tested: ScreenThief, VideoThief, FLIP, GRABBER, SNARF. Using SNARF with default settings is straightforward, but there is a shortcoming - SNARF always saves screenshots to the folder where the user is currently in. That could be inconvenient or unacceptable. And there is no obvious way to change it. But there is a roundabout option. The initial idea had been found on this page. The result based on it: 1. SNARF [ Download ] 2. Open SNARF.EXE in a text editor in text mode (not hex), find snarf000.bmp and replace it for s:scn000.bin 3. Create a batch file, S.BAT for example, where besides a string for starting SNARF.EXE will be a command assigning the path to the folder screenshots will be saved into to a virtual drive S: The folder and path may be any: C:\SOFT\SNARF.EXE SUBST S: C:\SCREENS\ 4. Start SNARF: S [or S.BAT] 5. To take a screenshot: Alt + S There will be two beeps. The first at the beginning and the second one as a sign the process has completed successfully. After the screenshots are taken, go to the folder where they are saved in and replace the file extensions from .BIN to .BMP SNARF - Freeware.

Extract tar.bz2


Extracting tar.bz2 files in Linux, command line: tar jxvf file.tar.bz2 - j : filter the archive through bzip2 [ 1 ] - x : extract files from an archive - v : list the files processed - f : use archive file The command extracts the contents of a bzip2 compressed archive to the current directory. Tar creates an archive of one or several files. Then bzip2 is used to compress it. Or both processes are made at once by tar only, with corresponding options employed. The duality of nature - archived and then compressed - is reflected in the extension of the file ("tar.bz2") and requires two procedures to be performed while extracting: decompressing and unpacking. Hence both j (decompress it) and x (unpack it) in the command. [ 1 ] Sources for the option letters description: tar(1) - Linux man page and LinuxCommand.org