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CSS *.bang-bg { background:url("bt.gif") -48px -16px; width:16px; height:16px; } *.flag-bg { background:url("bt.gif") -64px -16px; width:16px; height:16px; } *.star-bg { background:url("bt.gif") -64px -32px; width:16px; height:16px; } *.star-bg:hover { background-image:url("wt.gif"); background-color:black; } *.flag-bg:hover { background-image:url("wt.gif"); background-color:black; } *.bang-bg:hover { background-image:url("wt.gif"); background-color:black; } *.screenreader-only { position:absolute; left:-9999px; top:-9999px; width:1px; height:1px; overflow:hidden; } /* Nonessential rules are not shown. */

Path Policy name Value Computer Configuration\Administrative Templates\Network\ Network Connections\Windows Firewall\Domain Profile Windows Firewall: Allow remote administration exception Enabled to allow remote administration. Disabled to prevent it.

The name of the file, including any given path relative to where it was The size of the file s contents, in bytes. objects:

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Problem You want to use many images on a page, but you do not want the performance penalty caused by downloading multiple image files Even on a broadband connection, it is not unusual for latency alone to slow the rendering of a page by 100 milliseconds per image In other words, the latency of downloading ten images will likely delay the rendering of a page by 1 second no matter how small the image files Of course, delays caused by latency vary depending on web server proximity and how busy it is You can combine multiple background images into one image file This file is called a CSS sprite For example, you could include most, if not all, of a page s background images in one file.

Path Policy name Value Computer Configuration\Administrative Templates\Network\ Network Connections\Windows Firewall\Standard Profile Windows Firewall: Allow remote administration exception Enabled to allow remote administration. Disabled to prevent it.

Iterates over the file s contents, yielding it in one or more smaller chunks, to avoid filling up the server s available memory with large files. If no is provided, the , which defaults to 64KB, will be used. Closes the file, so its contents become inaccessible. Writes any new pending contents to the actual filesystem. Returns if the file is big enough to require multiple calls to to retrieve the full contents, or if it can all be read in one pass. The argument works the same as in . Note that this will not actually read the file at this point; it determines the value based on the file s . Reopens the file if it had been previously closed. The argument is optional and will default to whatever mode the file had used when it was last open. without a Retrieves a certain number of bytes from the file. If called argument, this will read the remainder of the file.

You could also embed a library of list bullets, icons, and text decorations in a CSS sprite that is shared across your web site The key to using a sprite is to display it as the background image of a sized element and to position the background image at the exact horizontal and vertical offset of the embedded image The element must be the exact width and height of the desired embedded image; otherwise, parts of several embedded images may be visible in its background The element must be set to the proper horizontal and vertical offset, or the background will show the wrong embedded image or will show parts of several embedded images The measurements used in width, height, and background-position must all be in pixels because embedded images are measured in pixels.

Using the Registry To configure an individual computer to allow for remote administration through the Windows Firewall, set the following Registry value: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\ Parameters\FirewallPolicy\<Profile>\RemoteAdminSettings\] "Enabled"=dword:1 "RemoteAddresses=reg_sz:"IpAddress, IpAddress, localsubnet"

The values in background-position are negative because they move the composite background image up and to the left to position it You can replace <img> elements with CSS sprites by displaying them as background images within sized spans or divisions, but unless content images cause performance problems, it is more natural to use <img> elements When replacing an image with a CSS sprite, you can use the Screenreader-only design pattern to embed hidden alternate text that will be read only by screen readers This makes the CSS sprite accessible Pattern HTML <ELEMENT> <span class="screenreader-only"> ALTERNATE_TEXT </span> </ELEMENT> CSS SELECTOR { width:SPRITE_WIDTH; height:SPRITE_HEIGHT; background-image:url("SPRITE_FILEEXT"); background-position:-HORIZONTAL_OFFSETpx -VERTICAL_OFFSETpx; } SELECTOR:hover { background-image:url("HOVER_SPRITE_FILEEXT"); background-color:COLOR; } Location Limitations This pattern applies to any type of element Background images using CSS sprites cannot be tiled because the entire composite image would be tiled rather than just the embedded image..

Using VBScript This code enables the remote administration exception for the current profile. Set Firewall = CreateObject("HNetCfg.FwMgr") Set Policy = Firewall.LocalPolicy.CurrentProfile Set AdminSettings = Policy.RemoteAdminSettings AdminSettings.Enabled = TRUE WScript.Echo "Setting enabled"

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