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

 

CSS centering

 

1 ) CSS horizontal and vertical centering - 1 Centering a container with the whole content of a web page inside in the viewable area of a web browser by means of CSS. A box to contain the whole content of the page is CSS centered horizontally and vertically. More for modern web browsers : [ More ] : [ Open demo page ] 2 ) CSS horizontal and vertical centering - 2 Centering a container with the whole content of a web page inside in the viewable area of a web browser by means of CSS. A box to contain the whole content of the page is CSS centered horizontally and vertically. More conservative, than the previous method. Suitable not only for modern web browsers, but for older ones as well - like Internet Explorer 6 or earlier Maxthon. A shortcoming - it takes more efforts to maintain the CSS code compared to [ CSS horizontal and vertical centering - 1 ] method : [ More ] : [ Open demo page ] 3 ) CSS centering floated elements Floated elements of unknown width are CSS centered horizontally : [ More ] : [ Open demo page ] 4 ) CSS centering absolutely positioned elements CSS horizontal centering of an absolutely positioned element : [ More ] 5 ) CSS centering image CSS horizontal centering of an image : [ More ] 6 ) CSS vertical alignment CSS vertical alignment of a block element containing text and images. The method works for various combinations of inline and block elements : [ More ] 7 ) JavaScript + CSS centering Centering content of a web page by means of JavaScript and CSS. A block containing the content of a page is JavaScript + CSS centered horizontally and vertically : [ More ] : Two cases : 1. A block is centered, if screen resolution is equal to or greater than 1024x768 : [ Open demo page ] 2. A block is centered, if screen resolution is equal to or greater than 1024x768 + mouse cursor is moved over a link in an element of the page content : [ Open demo page ]

CSS vertical alignment

 

CSS vertical alignment of a block element containing text and images. It works for various combinations of inline and block elements. Example: CSS vertical alignment CSS vertical alignment HTML / XHTML. Code: <div class="parent"> <div class="child"> <div class="childcontent">CSS vertical alignment</div> <div class="childcontent"><img src="image.jpg" width="68" height="68" alt="Image" /></div> <div class="childcontent">CSS vertical alignment</div> </div> </div> CSS. Code: .parent {position: relative; left: 0px; top: 0px; height: 200px; display: table;} .child {position: relative; left: 0px; top: 0px; display: table-cell; vertical-align: middle;} .childcontent {position: relative; left: 0px; top: 0px;} Note: .parent and .childcontent may be floated left ("float: left;") or not, but .child must be without "float: left;" for this method of CSS vertical alignment to work. [ 1 ] As well as Netscape 6.01+, Mozilla 0.6+. [ 2 ] As well as Netscape 6.01+, Mozilla 0.6+.