I have a image of width:300px, height:400px;  My container size is  width:168px, height:208px;  I want to display only a part of the image so that it can fill the container.   like:  Suppose top left corner is 0px 0px bottom right corner is 300px 400px of the original image.  I want to display picture from 10px 0px(top-left) to 200px 208px(bottom-right) such that it fits in the container.   How to do this in css?
Let's say I want a way to display just the the center 50x50px of an image that's 250x250px in HTML. How can I do that. Also, is there a way to do this for css:url() references?  I'm aware of clip in CSS, but that seems to only work when used with absolute positioning.
theorem numbering: section counter but remove the section number When does Thread.CurrentThread.Join() make sense? When & How often do 4e Monster powers recharge? How often should I roll power recharge rolls and at which point in the monster's turn do I re-roll them?  I'm trying to find the official definition of the recharge mechanic in the online compendium and I'm not seeing it there. Why more (and varying number of) logical reads with read ahead (prefetch)? After creating tpch database in my SQL Server, I tried below query:      set statistics io on     DBCC DROPCLEANBUFFERS;             select top 100 * from dbo.lineitem order by l_partkey;   The table lineitem has a non-clustered index on l_partkey. I issued the above queries for several times and found out that the logical reads vary each time:      Table 'lineitem'. Scan count 1, logical reads 1019, physical reads 4, read-ahead reads 1760, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.     Table 'lineitem'. Scan count 1, logical reads 1007, physical reads 4, read-ahead reads 1720, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.     Table 'lineitem'. Scan count 1, logical reads 1030, physical reads 4, read-ahead reads 1792, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.   From the post here: , I know it could be caused by read ahead behavior.  BUT exactly why read ahead could cause more logical reads? How does it change the SQL Server behavior? Like SQL Server may read more index page since it's in cache anyway?  Anyway, I disabled read ahead and issue the above query again. Now it reports the same amount of logical reads each time. BUT the logical reads is much smaller!!      Table 'lineitem'. Scan count 1, logical reads 404, physical reads 160, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.   So my question is, why the read ahead feature could cause many more and various logical reads count?  Out of curiosity, I tried another query without the "order by":      select top 100 * from dbo.lineitem   Here's the result without read ahead:      Table 'lineitem'. Scan count 1, logical reads 5, physical reads 3, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.   Here's the result with read ahead:      Table 'lineitem'. Scan count 1, logical reads 15, physical reads 2, read-ahead reads 3416, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.   The one with read ahead still has more logical reads. So, why? Can an html element have multiple ids? I understand that an id must be unique within an HTML/XHTML page.  My question is, for a given element, can I assign multiple ids to it?  &lt;div id="nested_element_123 task_123"&gt;&lt;/div&gt;   I realize I have an easy solution with simply using a class. I'm just curious about using ids in this manner. How do I address unchecked cast warnings? Eclipse is giving me a warning of the following form:     Type safety: Unchecked cast from Object to HashMap   This is from a call to an API that I have no control over which returns Object:  HashMap&lt;String, String&gt; getItems(javax.servlet.http.HttpSession session) {   HashMap&lt;String, String&gt; theHash = (HashMap&lt;String, String&gt;)session.getAttribute("attributeKey");   return theHash; }   I'd like to avoid Eclipse warnings, if possible, since theoretically they indicate at least a potential code problem.  I haven't found a good way to eliminate this one yet, though.  I can extract the single line involved out to a method by itself and add @SuppressWarnings("unchecked") to that method, thus limiting the impact of having a block of code where I ignore warnings.  Any better options?  I don't want to turn these warnings off in Eclipse.  Before I came to the code, it was simpler, but still provoked warnings:  HashMap getItems(javax.servlet.http.HttpSession session) {   HashMap theHash = (HashMap)session.getAttribute("attributeKey");   return theHash; }   Problem was elsewhere when you tried to use the hash you'd get warnings:  HashMap items = getItems(session); items.put("this", "that");  Type safety: The method put(Object, Object) belongs to the raw type HashMap.  References to generic type HashMap&lt;K,V&gt; should be parameterized. Convert ls -l output format to chmod format Say I have the following output from ls -l:  drwxr-xr-x 2 root root 4096 Apr  7 17:21 foo   How can I automatically convert this to the format used by chmod?  For example:  $ echo drwxr-xr-x | chmod-format 755   I'm using OS X 10.8.3. they were question banned; it turned out it (in part) it was because of deleted questions.   was deleted by the Community user.  I'm aware it will delete old posts that have a negative score, but for a minute or two, I was really puzzled as to why it was unilaterally deleted without some notation left.  Can we have the Community user leave a notation in a post's history as to why the post was deleted?    Something like the following would suffice:     Post deleted automatically due to having negative votes and no activity for three months I am running a critical research program on a Windows 7 PC that needs to run uninterrupted for several months. I have had to re-initialize the entire experiment several time due to unexpected restart. Windows Update is disabled, and I have removed automatic updating from all background programs that have an option for it, but I am still getting restarts at random intervals that completely destroy my experiment.   Is there some way to prevent any and all restart requests? What do Pentax and Sigma DSLRs offer that differs from Canon and Nikon? We have a question and answers outlining the . I'm interested in the other DSLR makers, and how the cameras they make compare in terms of significant features, system design philosophy, and unique or interesting photographic capabilities enabled or made easier by these cameras. Likewise, what such things are not handled as well?  Take "the big two have more market share" and the associated advantages of availability, accessibility, and third-party support and documentation .  I'm not interested here in compact cameras, interchangeable-lens cameras with electronic viewfinders, or in rangefinders. (If you're interested in that, though, see )  P.S.: Differences in lens lineups are covered at I want to remove all the files from different directories, and want to keep only latest files 20 files. is this the correct command to do this?  ls -t1 /mnt/dwh/ftp/dwh_ftp_cbs/ARLOGS/ | tail -n +22 | xargs rm -f Strange behaviour of macros C/C++ 'AND' vs '&&' as operator C++, array of objects without What is the variance of the weighted mixture of two gaussians? Why is a home fiber connection asymmetric? I recently switched from an ADSL to a fiber connection and was surprised to see that the bandwidth is asymmetric (1 Gbps down / 250 Mbps up).  While this is understandable in ADSL, I do not understand why fiber at home is asymmetric as well? It is not a limitation of the technology (I have symmetric fiber at the office, and always had) Is there a kind of microdata or markup that creates "results x of y" in search results Why aren't there any fighter carriers in the Star Trek universe? All of the ships of every species seem to be medium to large vessels with multiple crew members. Why aren't there single fighter craft and carrier ships to transport them in mass?  I've just noticed the difference between Battlestar Galactica and Star Trek, where the former has primarily aircraft carriers, and the latter has battleships.   Wouldn't a huge fleet of small fighters be extremely maneuverable and possibly stealthy?  Update:  For clarity, my question is not about the Federation and their choice of ships, but the universe at large. I would think there would be some diversity in space warfare strategy, such as huge armadas of fighters with base stations / carriers. Add transparency to an existing PNG I'd like to use this image on a web site.    What I need to do is change the background from black to transparent, so I can use the arrow on my site maintaining the page background.  I used Gimp to convert the image to .png, but how do I proceed now? Making an MFC application international I've got several large MFC applications here, and converting them into any other format is out of the question.  We're expanding into other markets, and would like to make the apps work in other languages and cultures.  So far, I've found occasional references as to what to do with Visual C++ version 6, with one mention that later versions of MFC have additional relevant features.  Searching MSDN gives me instructions on how to convert the apps to Unicode, which we already did.  I found nothing on MSDN on how to make languages multilingual once they're in Unicode, only a few older things using Google, and one book about internationalization using VC++6.  (We're using Visual Studio 2008 now, on XP and Vista.)    I make no claims for the strength of my Google-fu, and would be happy to be directed to things I've missed.  Is it reasonable to use the methods of VC++6, or should I use later features?  If I should use features later than that, where can I find some reference to them?  Is there something I should worry about other than setting the locale, converting all strings to resources, and duplicating resources in different languages?  I can find more things about .NET internationalization, but I'm inexperienced in .NET.  What will I find there that's applicable to VC++ and MFC?  Edit:  I just ran into difficulties trying to put Unicode strings into the String Table resource.  (As far as I can tell, Unicode strings need to be entered into the .rc file with a text editor, in L"0x0034" form.  I haven't found a resource editor way to do that.)  Any tips on that?  Any other resource I can use in VS2008 using VC++ and MFC?  Edit:  Somebody on a Microsoft forum suggested that I open the offending .rc file in Notepad, and save it in Unicode.  Unfortunately, this doesn't seem to fix the dialogs, although the stringtable seems to be working in Japanese.