Is it wise to use a Fluid Layout? - css

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I've always preferred fixed-width layouts over fluid-width layouts, one of the main reasons is that I'm able to better understand how the whole picture will be without having to worry about the screen resolution.
But now the "picture" has changed, there is a high discrepancy between the lowest and highest resolutions used by most users nowadays and they seem to be here to stay.
I've a netbook that only supports 800 pixels or 1024 pixels wide; I also have a 22" monitor that supports 1650 pixels and, 24" monitors that support 1920 pixels and more are becoming pretty common.
I've pretty much "ignored" the 800 pixels users for some time and I've been developing with fixed 950/960 pixels wide, I also notice that popular sites (SO for one) either use this approach or the fluid one.
For text (almost) only websites (like Wikipedia) I don't see a problem using the fluid system but what about all the other websites that depend on images / video to create interesting content? Social Networks, Classifieds, and so on... What is (will be) their approach to address this issue?
Seam Carving seems like a good option for the near future but it hasn't matured enough (neither browsers nor jQuery nativelly support it at this point in time), I also feel like users wouldn't understand it, get confused with it and as a consequence abandon the website.
The de facto standard on the web is still 1024 pixels wide, and leaving 980 pixels unused in a 24" monitor just seems plain odd not to say wrong. So what are our options?
I would love to hear what you think about this and your experiences with both fluid and fixed systems.
PS: Popular websites using either one of these systems are also welcome, I'm specially interested in seeing non-text websites that use the fluid system.
EDIT: I just saw this answer and I got kinda confused about the difference between fluid and liquid layouts, aren't they supposed to be exactly the same?

I generally think that fluid layouts are a good idea. The problem starts when your fluid layout starts to get really wide with high resolution screens - there is a limit to how far the human eye can track horizontally without losing the vertical positioning. That is why newspaper columns, for example, are always rather narrow.
Try to look at wikipedia in a high resolution screen, and you'll see that they limit the maximum width to something around 800-900px - more then that (assuming a rather standard 12pt font) and people stop being able to read until the end of the line and then effortlessly find the start of the next line, and the whole thing breaks into a mess of eye and neck strain.
On web sites I build, I use max-width to limit the maximum width of the text content (and in that I also include images and other stuff) to about 720-800px, which with sidebars and such can possibly get to around 1000px. If the screen is wider then that, then either center the content of left align it (right align on RTL web sites) - both work well.
But you have to design your layout so that it flows when the available width is narrower - this is very useful for people with netbooks (which are rather popular now and I expect will become more popular in the future), smart phones and even small screen mobile devices. Such mobile devices more and more feature standard browsers and you should address this in your designs - even if a mobile browsers can reduce your website somehow, the "mobile mode" usually does this by messing up the page and killing your intended user-experience.

leaving 980 pixels unused in a 24" monitor just seems plain odd not to say wrong
I’d disagree here. If you’ve got a monitor with that high a resolution, you’re probably not running with a maximised browser window. And even if you are, are you really fussed that the content’s all in a fixed area in the middle? Really?
As long your site has a decent, useable layout, I don’t see the problem with space either side on high-res monitors.

There are ways to create different #media rules inside of a stylesheet—W3C has something on this—and although it's a big Schroedinger's Cat whether the handhelds' browsers will obey the rules, it's fairly safe to assume that, even if they don't, they have big enough and well-ratioed screens to just use a scale model of the site as it appears on desktops.
Seems to me that it was in the devices' manufacturers' best interests to make them compatible with web sites that predate the advent of such devices by 5-10 years.
And if not, it's their problem.

I approach the problem from a different angle. Have a fluid layout but give it a minimum width (rather than a maximum width). You can achieve this with CSS.
The problem with the images is not such big. What you do is the following:
Upload your image at the maximum size you expect to have.
Make the image fluid as follows:
<img src="http://example.png" style="width:32.5%">
As you resize the page the image will re-size itself at the percentage width. Just make sure that you don't have any width or height attributes in the image. I call it superlastic :)

Fluid layouts were the answer before Responsive Design support in browsers came out. No need to use fluid or elastic layouts anymore.
http://lessframework.com/
https://github.com/thatcoolguy/gridless-boilerplate

There is no right answer to this question as no two design goals are ever alike. Fluid layouts make any semblance of typographic control virtually impossible, but not all designs need or want it.
No collection of "best practices" will ever equate to an actual design education, and not all users feel compelled to blow their browser windows up to fill the entire screen, either.

Most informative discussion on layouts I have read so far is in Andy Budd's CSS Mastery book. If you get a chance, do read it. I think it's a must have book on CSS (intermediate level). It looks like the layouts chapter is available in article form here.
http://www.webreference.com/authoring/style/sheets/css_mastery2/
Another link :
http://www.smashingmagazine.com/2009/06/02/fixed-vs-fluid-vs-elastic-layout-whats-the-right-one-for-you/
Liquid and Fluid are two different names for the same technique.
HTH.

I think it's better to have a maximum width of the layout, you can change that with Javascript.
A good example of that is this layout, look what happens (in Firebug or something) with the layout if you change the width: http://tweakers.net/
They have chosen a width of 1208px and make it smaller with Javascript when the width of the browser changes. With Javascript disabled, the website is still 1208px wide, which seems not to be a problem anyway.
EDIT:
The first width of the website will be like 900px. With Javascript you will check the width of the browser and you give the a class with the closest resolution to your browser width. For example: the browser width seems to be 1100px, so you give a class 'res1024', or the browser width is 1080px, then you give a class 'res1100'.
This will be your CSS:
#wrapper {
width: 900px;
}
.res1024 #wrapper {
width: 1000px;
}
.res1100 #wrapper {
width: 1080px;
}
I hope it helps you :], you can ofcourse change a lot more with this body class, like:
.res900 #menu {
width: 100px;
}
EDIT 2:
You can handle images the same way:
.res900 img.fluid {
width: 200px;
}
.res1100 img.fluid {
width: 300px;
}

Related

What's the point on using % units in responsive design?

I'm redesigning my site because looks awful on different resolutions (apart devices), most guides and tutorials rely on % and em than fixed values. I'm still learning this so I'm reading everything around.
Thought this would solve the question with different display sizes but again: we have to craft some more CSS for fix some specific issues.
If I need to add media-queries for extra display sizes, why use % then? Do use % really reduce coding? Is ok need to add some extra css for some sizes or am I doing something wrong?
Thanks for any advice!
The purpose of using em sizes is to allow the base your design off of the user's choice of font size. I may use a larger font size because I have a huge monitor and poor eye sight, while someone else might prefer a smaller font. By using em units, your design will accommodate both of our font preferences and resize accordingly instead of forcing the font size to a given standard (eg. "12 point font").
In a similar manner, percent (%) units allow your design to respond to different browser sizes. Used in conjunction with em units, this will allow text-based elements to respond to arbitrary font size choices, and layout elements to respond to arbitrary browser sizes.
It is perfectly acceptable to design a single responsive design for all media types. Media queries are intended when you want different display styles on different devices, not to "support" different display sizes. An example would be to use serif fonts on print media and sans-serif fonts on display media, since usabilities studies have shown that these font faces are preferred for these sorts of media.
Furthermore, it allows you to do custom styling for some situations like mobile devices, where you may want to consider that the user has a limited amount of bandwidth and maybe cut down on extra images. Or if you want to display your content in a completely different layout for the microscopic screen afforded by certain phones.
% allows your site to be responsive to the user's method of viewing. Let's say you have a div that's at 100%. It'll fill the entire section, regardless if it's on a phone or desktop.
It should be okay to add extra CSS for sizes as well. As far as I know, you can have some elements display in % and some with a fixed px value, although they might conflict depending on how the page is setup or what it is being viewed with.
For example.
Your website header have the width of 950px; But in a mobile device, it may fit at 450px;
So, you use media-query to reposition some elements and handle some size issues and set the header width to 450px;
But, if you use % values, you can set your header div to have 100% of width base in its parent. So you can only change the body or some container div width, the all childs going to adapt.
Diana,
I am glad I came across this question. I literally just uploaded my first responsive design which is 90% based off of percentages when it comes to font-size and widths.
Check out the below:
http://www.noxinnovations.com/portfolio/responsive/
Obviously, it doesn't look amazing, and the image looks way out of place... But do me a favor and resize your browser window, by slowly making it smaller and smaller. I did that by setting a percentage width!
Trust me, I tried doing this responsive design test with pixels, and it didn't turn out too well. The percentage width ensures that regardless of the resolution and or pixel dimensions (per se) the design will always cater to the size of the screen. Also, I did not have to use one CSS3 Media Query, but I would highly suggest using CSS3 Media Queries only when you need them.
In my opinion, I should probably have a Media Query for a larger screen.
I hope this helps you as much as it has helped me!
Thank you,
Aaron

When do you choose liquid CSS layouts over fixed? Why?

I was wondering what are you opinions about when coding css, when/why coding fixed or liquid style sheets?
I agree that fixed size style sheets are easier/faster to code because liquid requires more time in order to have all elements well adapting to their parents.
So, when do you chose liquid over fixed (or vice versa)? Why?
Update 2 I think the best practice now is design a site with responsive and adaptive capabilities for any screen size. Liquid CSS may not have the pitfalls that you would think such as long lines of text (instead the block of text position adjusts on-the-fly) - examples of Responsive Design - browser-side code where pages adapt to any screensize:
http://surrey.ac.uk/
http://bostonglobe.com/
http://thoughtfulweb.co.uk/
Adaptive design: server hosting the site detects browser type that requested the page and serves up appropriate page layouts e.g. mobile. This has pitfalls in that the user agent identifiers aren't always precise - e.g. many browsers include the mozilla string in their id, for example, so it might not always be best to rely on this data.
Previous answer
Liquid layouts (layouts that horizontally shrink or stretch to fit the horizontal width of a window)
Advantages: the content reformats on the fly to fully utilise the
Window width. Which means that the dilemma of choosing the most
popular fixed width e.g. 940px, 960px or 978px is not required. This
is particularly useful for small screen handheld devices which vary
slightly. You have to do less work in considering all possible screen
sizes.
Disadvantages: For the reason that the site will shrink or stretch to
fit horizontally, you cannot control the layout as much as fixed
width. Aesthetics and how nice the site looks will be less under your
control. You may find that my point about having to do less work to support all screen widths is not true after all - as here you are considering scenarios where the screen is really small and your menu navigation is all bunched up and ugly or too far apart on a large screen
Fixed layouts (layouts that are fixed and don't change to fit the available horizontal width).
Advantages: Once you have settled on the most popular width e.g. 940px, 960px etc. you would not need to test the site at different screen widths. The layout is neat and things don't move around, aesthetics, how nice things look remains constant
Disadvantages: Some users with small screens, handhelds may need to scroll horizontally to view your site if your fixed width is larger. Unless you also support a mobile edition too that those users can use
Have a look around at major sites - what are they using. To me it seems fixed widths are more popular, including stackoverflow.com
That said, look at this fluid site: http://derekallard.com/
Here, the developer uses fluid layouts to advantage by using layers of graphics that slide over each other as the site width adjusted in your window.
update: There is no wrong or right answer. Both Have merits. Media folk who have come from television, film and newspaper into web may tend to favour fix widths owing to their familiarity with those media having that.
It's not a matter of technique, it's a matter of decision making.
You choose liquid if you (or the client) WANT liquid.
I myself do NOT WANT liquid. Why? With a very wide window you get very long copy text lines, which are hard to read.
OK there are some other parts you must consider. Is your page intended to be accessible? Then you have to make a sort of liquid layout for the ones which zoom the page.
You could also look for responsive web design. The one that works in mobile browsers, too.
http://www.alistapart.com/articles/responsive-web-design/
When left with a choice, I rarely use liquid layout in anything except business style web apps.
I.e. for apps where the customer insists on lots of horizontal information in e.g. tables, I'll go with a liquid layout for obvious reasons. For more standard websites, I'll stick with fixed if at all possible.
When I do go liquid for the latter, I'll mostly still enforce a max-width on copy text, because I'm not particularly politically correct, and making the site a joy to read for 99% of visitors is more important to me than making it a (relative) breeze to use for a few - as long as I keep it accessi­ble to those few. Like yunzen says, line length of copy text is very important to both design and readability. Don't let those lines stretch to infinity...
Mostly, my fixed layout sites will have different ways of accomodating the smaller screen size rather than just simple liquid stretching - moving side bars and such beneath the text, and possibly adjusting the copy text width to fit the device viewport. Sometimes, but not always, that requires css media queries.
(see e.g. http://www.quirksmode.org/mobile/viewports2.html)
Usually fixed layouts are easier to design and develop, also visitors are used to this kind of layout.
Fluid layouts need more planning and also do not fit in all kinds of web application. I do not use the fluid approach very often.

Fixed width website the only real possibility?

When creating a web-site design, is the only real option to provide a fixed content width?
I notice most major websites (this one included) center all the content into a fixed width, which ensures all elements look correct on all screen sizes.
I think I already know the answer to this, but a colleague seems to think that there should never be a horizontal scrollbar and a website should resize to the users screen width. I make the argument that text can resize but other elements can’t (buttons, textboxes etc), so a fixed width is the only option.
I'd love your opinions each way.
Surely fixed width is the only way you can guarantee the correct layout on ALL browsers?
You can get clever with floats/media queries to make layouts work well at narrower widths.
But it is indeed more common to go with a fixed width:
It’s easier to design
Not many people have narrow monitors these days — most websites seem to assume they’ve got 1000 pixels of horizontal space to work with, and I haven’t heard of them getting many complaints
Touch-based OSs (iOS, Android et. al) make zooming web pages feel very natural, so pixel dimensions aren't quite as important there.
When lines of content get too wide (I think more than around 60 words?), they get difficult to read, so there’s not much advantage to be gained from having elements expand to full width for users who have bigger browser windows.
I think the most likely group of users to have less horizontal space available is smartphone users, and you’re going to want a specific design for them if you care that much about their experience.
Oh, just one thing though: “Surely fixed width is the only way you can guarantee the correct layout on ALL browsers?” With the greatest possible respect, that’s a bit of a programmer’s way to think about it. You can’t guarantee anything about web page rendering. Browsers and operating systems can do whatever they want. That’s the web. Let it go.
Dynamic-width web-sites are generally composed of one or many percentage-width blocks which make 100% total. So blocks size change with resolution or browser resizing, but if total width is too short it can occure lisibility problems, so a minimal width is specified for <body>, in which case a horizontal scrollbar appears.
But you can think differently : http://www.smashingmagazine.com/2008/08/14/will-horizontal-layouts-return/.
I tend to make my websites have a minimum width for legibility, but otherwise the width is determined as a percentage of the window size (I normally pick 80%).
I find this gives me ample coverage of the viewport, whilst still looking good on larger monitors.
I find this approach fails on larger screens when there is little content, as the content tends to get stretched into a line at the top of the page, which can make things confusing. So for those pages it can be good to have a fixed width, centred style.
No. A thousand times no.
If your website presents any kind of body text, fixed width is an abomination from the depths of the mid-90s, forcing readers to scroll like crazy, while being mocked by vast expanses of unused screen space to either size. (Now, a variable number of columns I might buy.)
BTW: flag for CW.
Horizontal scrollbars are a big problem. A properly designed website should be able to scale down to be used on small resolution screens (640x480). Also, it's nice to have to have my browser window maximized just to browse a site. Also, there's no reason why a person with a high resolution monitor shouldn't be able to use the extra space their monitor gives them.

Is it bad to work with pixels in CSS? [closed]

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Is it bad in terms of compatibility to use pixel numbers in CSS instead of percentages? How about lower resolutions? Is it okay to work with them in ranges of 1-100?
All of the measurements have their own purposes:
Use pixels for pixel-based things, like borders. You probably don't want a border that ends up being 1.3422 pixels wide.
Use text-centric measures (em, ex) for text-based things, like content areas, labels, and input boxes. It's an easy way to make sure you have room for text of a certain length and width.
Use percents for window-based things, like columns.
There are exceptions, of course. For example, you might want to specify a minimum column width in pixels. But follow the above and your pages will scale well. ALWAYS zoom in and out on your pages to see how they work with different font sizes and browser shapes -- don't get surprised later.
This is a difficult question, because the answer mostly depends on your situation.
Pixels are not that bad, I mostly use them too. (Sometimes even for font sizes.)
I usually fix the outer block element of the layout by a given size (pixels with fixed-width layouts, and percentages with fluid layouts), and on the inside elements I usually set percentages whenever possible.
There are some elements which simply can't be styled with percentages or ems, especially the more fancy stuff coming from graphical designers who don't understand such principles.
For example: if you have a column on your site with a simple style, you can set its width to a percentage easily, but if it has a background image with a specific width that is not designed with scaling in mind, it only looks good with a fixed-width. In such cases, you'll have to ensure that the rest of the page occupies the remaining width correctly.
Note that you can use pixels with percentages together.
For example, this is a snippet from one of my latest web apps:
min-width: 800px;
width: 80%;
max-width: 1500px;
The choice also depends on what design or layout you would like to achieve.
For a fixed-width layout, pixel values are fine. If a designer gives you a Photoshop image that contains really fancy stuff which would be extremely complicated to even think about how it would resize, you should definitely go for this.
If your layout needs to be dynamic, you should use percentages to make sure that it expands as the resolution changes, and you can use the above code snippet to make it look better in scenarios where it would otherwise look insane.
Some layouts (eg. imagine if StackOverflow would take up all the space) would look pretty ugly on a width of eg. 1920 pixels - the line widths would be so insanely high that it would be extremely unconvenient to read.
This is what max-width is for. Even in some dynamic layouts, you'll have to limit the maximal width of your site to maximize usability and readability.
And also take into consideration the smaller screens.
It is true that noone uses a 800×600 desktop anymore, but many people browse the web with mobile devices which have even smaller resolution.
This is what min-width is for: to make your dynamically expanded layout look less crowded on smaller resoultions.
I hope this helps.
EDIT:
The Smashing Book has some very nice thoughts about the subject.
EDIT 2:
I don't want my post to sound like I want you to force pixel-based sizing on your visitors.
(Apparently, some people in the comments misunderstood me in such a way.)
To clear it up:
I believe that the ideal layout is one that adjusts well to any possible resolution or setting.
However, we can't always do everything perfectly. Time/resources and the target audience are the key to determine if your site requires that advanced functionality or not.
I'm suggesting that you use the right thing for the given job.
If you are developing a site which will have a significant percentage of visitors who require more advanced adjustments to the site, it may be well worth it.
(Of course, sometimes we just do it for ourselves to have the feeling of doing things the right way, but is is not always a financially sound decision.)
Still, you should do the proper research about what sort of site will be it, who will be the visitors, and such stuff, before deciding about layouts, and whether it is worth the time to make them fluid or more dynamic.
Font sizes
I think you must first understand the issues that exist with working with pixels in CSS:
Zoom in older browsers is broken. For example, IE6 and IE7 do not resize text when zooming. Line-height can be quirky too. These problems do not exist in modern browsers, but they are a reason why many shy away from using pixels for font sizes.
Everybody will see text the same size if you specify the font size in pixels. Browsers have a default size of 16px for paragraphs, so if you only use em and other relative sizes, you will respect the decision of users who change this. This is especially important on text heavy sites, especially if there are more older users. On the other hand, if the design of a site is important I think it is possible and justifiable to use px to specify font sizes without breaking usability.
In the end, you need to make the decision yourself, and it does depend on the exact circumstances, but I think that specifying font sizes in pixels is okay.
By the way, when working with em to specify font size it is a good idea to set the body to font-size: 62.5%. This means the base font size is 10px, so 1em is 10px, 1.6em is 16px and so on, making it easier to think in pixels while designing using ems. I still find it frustrating to work like this, especially when the values of ems cascade. There are some very handy sites like PXtoEM.com that help with this.
Layout issues
The screen is a pixel based layout, so pixels are an intuitive choice for many things. The main issue here is that different users have different screen sizes. As others have pointed out, using min-width and max-width in pixels along with width in percent is a helpful way to respect the size of the screen, while preventing your site to be unreasonably squished or stretched on very small and very large windows.
However, I would generally avoid this approach in favour of CSS media queries. You can then use fixed width chunks and make the layout wider (amongst other things) as the screen size increases. However, CSS media queries, like all cool web technologies, suffers from lack of browser support. Most notably, IE8 and earlier do not support them, although there are JavaScript fixes. On the other hand, the iPhone and other handheld devices do support them, and I would strongly recommend them if you want your site to look nice on these devices.
I think fixed width grids are fine. Fixed width grid systems like 960 Grid System
are popular enough in their own right, and there are so many other sites that have a fixed width, that I doubt you would hear many complaints if you did this. Handheld devices that do not have large screens are an issue, but this is where CSS media queries should be used, so it is possible to specify everything in pixels and have your site looking beautiful on the desktop and on the iPhone.
Conclusion
Ultimately, everything depends on who your users are, what you need to support, and what you want your site to look like, but there is nothing inherently wrong with using pixels in CSS.
That depends on what you are styling. For columns for example, the width should probably depend on the text size to ensure that it will look optimal on multiple resolutions/screens. If you want to divide your page in two parts, you should use percentages. But if you want a 1px border between these two parts, independent of the resolution, use pixels.
Basically it depends on who's hiring you and consequently the audience of your work.
For institutional purposes (where content should prevail over the shape, like a goverment project), you better work with .em or %, they are harder to control, but they will be really user friendly in terms of accessibility.
If we talk about corporative Websites (Where shape is the deal) pixel will be a more accurate tool to fulfill your customer expectation regarding his brand.
A liquid interface (%, .em) is always a good stuff when it is smartly done, but don't forget to check your design under extreme conditions and be sure that it will be stable.
If you work with pixels, you will have absolute control over the final look of your site, but you will have to assume the impossibility for some user's to operate with it efficiently.
Best option: rather than designing a Website compatible for all platforms (what will result in a multi-deficiency design) suggest your customers special versions of the site adapted for every demand, what is a better practice and a better business for a designer too...
I would say avoid it if possible except for in certain cases.
For instance for a thin border it's ok to just specify 1px.
Also for max- and min- style attributes it is ok. But then make the non-max/min attribute be a percentage if possible.
This really is a good question which I have asked many times before. Not being a hardcore web designer (I'm more on the development side) I've usually asked the designers I work with about their opinions, and here is what I have distilled:
Using percentages vs pixels for sizing elements and so on is really a matter of personal taste or the requirements in each specific case. If you need it to scale, or it will scale well, use percentages. If not, use pixels. People here have used the examples of major columns in a page maybe needing to be fluid but borders may well need the precision of a pixel measurement.
Obviously sizing images is pretty much tied to their resolution and pixel units, so I always use them in this case.
However, using em sizing versus pixel or even point sizing for text is a whole different kettle of fish. Most of the guys I work with have a base reset style for font sizes which brings the size of 1em down to about 12px. They then use ems everywhere else (or as near to everywhere else as is possible) to size text elements, form controls and the like. This is how I operate now too as it seems to work well across a variety of browsers, OSes and DPIs on desktops and laptops. I can't vouch for mobile devices though.
Accessibility is the key though - if you need to make something usable for people with disabilities or work on a variety of devices out the box, even things you may consider old, then scaling will be a requirement. Build it into your model for designing the site from the get-go and you may realise that absolute pixel sizing is not even needed in that case.
For example, an art-heavy design is probably going to be designed at a single scale, but the new educational website for disabled users is going to have to work in a variety of situations.
Just remember, the W3C put a variety of methods for sizing and scaling into their specifications for a reason - flexibility. Do whatever fits best and works well for your audience (as Moustard said earlier).
I'm not a css/html expert but convention I use is to use pixels for the outer containers and percentages for the inner objects.
Another rule of thumb I have with anyone reviewing my layout is a Three Pixel Rule. It is rare that everything will line up exactly within every browser out there. We've agreed the effort outweighs the benefits to move anything three pixels or less.
Do the right thing by default. If a user visits your site with javascript disabled and no preference cookies, you should serve them a web page that is as functional and accessible as possible.
Your default stylesheet should assume nothing about the browser window, and still render a functional page, however hideous, down to 320x320 resolution, and up to unbounded sizes. If photographic fidelity is so important that you can't trust browser scaling, and sometimes it is, then you should use pixel measurements (at least minimums) for elements encapsulating images of fixed size, to make sure that you don't end up with important things being covered up. Specifying minimum widths along with percentages should give you the control you need while giving your users the accessibility they need. Even if accessibility isn't an issue now, it will be later if the site is successful.
When you do know more about the browser window, then it's okay to use fixed widths in alternate stylesheets, if the importance of preserving the design justifies the added work.
If you're targeting a fixed size then pixels are fine. But if you want your layout to look good on various resolutions/screen sizes, then you should stick to more relative measures like percentages. Most folks are targeting the latter.
It is ok if that is what it takes to please your client. Most of the time, you can't balance the amount of space in diverse screen sizes with only percentages. CSS3 media queries helps here but adoption is still problematic.
I prefer pixel in most cases.
For example - default width of content ares: 960px.
In "1024" it will be ok, with small free spaces on the both side of the screen. Put some gradient or background there. In "1280" or "1440" or "1680", or whatever - there will be bigger and bigger gap, but it will look nice.
Yep, for 800 - this site will be ugly. But who cares? Every major players dropped support for 800. There are too few people with this resolution..
There are many various sites, where %% will be much better solution, though.
The building blocks of a screen are pixels. You can't go wrong with fixed pixel sizes. As other posters have mentioned, you can also use percentages or "em"s for a scalable substitute.

Width of IE explorer scroll bar?

I have a client with a resolution Width of 1200 on their monitor and I need to maximize the width of my web site but I don't want the client to have to use the horizontal scroll bar. What is the max width you can use in a website in IE 7 with a screen resolution of 1200 without needing to use a horizontal scroll bar(Other users will have a larger width and all users must have the same width)?
Extra info- The web site is already built and can not use a width of 100% as this has bad consequences in a non textual web site. Yes the resolution is a width of 1200 (the client has a 1920 X 1200 resolution monitor that is set on its side).
The OS is Vista and as the client is government he will have Vista at least through 2010 and can not change his theme/browser etc.
You asked two questions, really. To answer the title question:
20px (IE7, Windows XP, Default Theme)
Everybody else has done a great job of answering the real question.
how about:
body{
width:100%;
}
and by this I mean, let the user size their browser to whatever they want, and make your content fit their screen.
Update:
As users have noted below, sometimes 100% is a bit too much... for those cases I would highly recommend this article & demo by Cameron Adams (The Man In Blue) that applies fluid layouts that re-arrange the content/CSS bases on the width of the browser.
Simple, the maximum width is 100%.
Seriously though, what possible reason could you have for designing a website to the scale of a single persons single computer? What happens when they buy a new computer?
I design any fixed-width sites to roughly 900-1000 px and center it. This is the general approach taken by most sites and I strongly recommend not straying from it unless your design is capable of using percentage widths. Your client will understand if you explain it in these terms and show them any of the thousands of popular sites following this behaviour.
Just don't hardcode any pixel widths?
It doesn't seem likely that you're going to get it down to the exact pixel; since users can change their Windows theme, the right-hand scroll bar can vary in width.
Most websites I have seen do this allow their website to "float" into the width of the page by using CSS.
If you don't want to set the body width in css to 100%, then set it at about 95%. That will still allow the page to expand/contract to the end-user's desired width, down to only 400 width without a horizontal scroll.
The following formula should work for you, whether you use it for minimum or maximum page widths.
$safe_PgWidth_Percentage = (1 - (20/$minPageWidth));
While users in a restricted environment may not be able to change their operating system, browser, etc. I cannot imagine that they would not be able to grab the corner of their browser window and reduce or enlarge it by dragging.
That's the point your commentors are making. Coding the body to a percentage, in fact as close as possible to 100%, takes care of useability issues, including fixing your horizontal scrolling dilemma.

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