Started working on a new web application recently and noticed they insert images into their pages by using css pseudo-elements. What is the point of this? Why not just use a normal img tag?
Hi Chopper Draw Lion4,
That's a great question which has several possible answers.
Its an older site and they were doing the old image replacement technique
This was popular circa 2000 - 2010 when people believed that using text was more beneficial to SEM/SEO than using an image with an alt tag. It was "all the rage"
It could be useful in responsive markup. Depending on what kind of image/size. It may be that image only shows at certain response points. (yet one would still wonder why not hide them image rather than use a pseudo element)
Unskilled developer who just discovered pseudo-elements. This doesn't need much explanation.
The application may have been written in a way which did not give the ui developer access to the core html code which is injected.
I suspect this is the most likely reason. And the one I have come across most often.
Situation: the ui developer needs to make something happen. But they have been forbidden from touching the actual coding.
Example:
"Dear ui developer, please insert smiley faces or frowny faces depending on whether this is a positive comment or a negative one."
<custom-directive data-grade="bad">{{Our Data is Great and You Stink}}<custom-directive>
<custom-directive data-grade="good">{{Your Data can Enjoy New Life}}<custom-directive>
What would you do if this is all you were given and there were no interior elements to which you could insert the smiley/frowny face?
Well, if it were me, I'd probably have to , at that point use a css pseudo element.
See this as an example to answer:
http://codepen.io/Acts7/pen/MJRrwa
Or this spiffy solution for a "star rating system"
https://codepen.io/Acts7/pen/BpEJRg
Hope this answers your question.
Related
I have a existing parent website and I have to design a new website with similar theme and css styles.
I do not have access to the code of the parent website in which I can look into the styling.
Is there a way I can extract or replicate the css style of the website and use it for the new one. I just need to get the same theme going in the new website as well.
I came across that I could use some adobe tools for the same.
Can anyone give a brief idea of how this can be done or is there a generic procedure to be followed in replicating the style.
Replicate given design using your own, most appropriate appropriate markup and CSS rules—and have some sort of QA process that will help you find obvious inconsistencies with appearance and interaction.
Why I don't think you want to copy HTML and CSS from the parent site:
The parent website can change its style later in an unpredictable way. You will have to duplicate these changes. Since you mentioned you don't have the access to the codebase, you can't just diff their changes and apply them to your codebase.
Therefore I'd say it's best to ignore the original HTML and CSS, and just follow your eye and have a QA that will carefully test your work for consistency with the original.
(I had to do a similar thing once, and I think it usually isn't required to follow parent website pixel-perfect—just consistent enough to facilitate painless navigation for the end user.
In cases where pixel-perfect consistency is required it makes more sense to build the additional website off the same codebase as original. You weren't given that possibility, so I doubt that perfection will be requested from you.)
I think Your trying to shoot fly with cannon. All javascript/css/html code is at Your hand when viewing sources. No advanced tools are needed.
For better look on minified files You may try developers tools provided by modern browsers like chrome and firefox.
You may also just use beautification tools for css and html like http://www.codebeautifier.com to get nice, indented document.
Just google html or css beautification and find the one that fit Your needs in best way. Most of them are free online tools.
The css is probably minified. This question shows ways to unminify it so you can read it.
Browsers such as Firefox and Chrome have a built in Code Inspector tool that will show you which styles are applied to each item. Just right-click on a page element (for example, a paragraph or heading), and select "Inspect Element" from the menu that appears. A toolbar will appear at the bottom of your window. Use the arrow on the toolbar to select different elements to examine. Usually the left side of that tool shows the HTML for that element and the right-side shows the CSS styles applied and the line of the css they come from. You can get a similar tool in IE by pressing the F12 key.
If you have a text editor that allows regular expressions in the search (Dreamweaver has this if you have the Creative Suite) use this search term with the "regular expression" box checked: #[a-z|0-9]{3,6}. This will find all of the hexadecimal values for the colors you need. It says to find the pound sign followed by either three or six letters or numbers, which will mostly be hexadecimal values (e.g. #333 or #333333 for dark grey). It may also bring up some IDs and you can ignore those and keep searching. You'll also want to search for rgba because colors may be listed that way. Using this in conjunction with the browser's code inspector will help you figure out the colors that are used on different elements. Some things may have background images, so you'll need to use the code inspector to figure that out. The code inspector will also show you how much padding you'll need, widths, etc.
I have a Windows 7 with service pack 1, and Internet Explorer 10. And I have my site, http://www.gfcf14greendream.com/ . It looks great on Chrome, Firefox and Safari, but not in Internet Explorer. For starters, I wanted to test how my site looks using IETester, and it's a mess (please compare by clicking the link above):
The thing is, I think that maybe the issue could be that IE8 doesn't load well from <object> tags, is that it? I use three object tags to load the three white parts: header, vertical menu, and "site log" (you can see them here: http://www.gfcf14greendream.com/header.html , http://www.gfcf14greendream.com/verticalmenu.html , http://www.gfcf14greendream.com/thesitelog.html)
To load those three sites, I use the following code:
This one for the header, <object type="text/html" data="http://www.gfcf14greendream.com/header.html" width="100%" height=185></object>
This one for the menu, <object type="text/html" data="http://www.gfcf14greendream.com/verticalmenu.html" height=484 width=100%></object>
And this one for the log, <center><object type="text/html" data="http://www.gfcf14greendream.com/thesitelog.html" height=600 width="90%"></object></center>
Please let me know if anyone has any ideas concerning this "mess". Thank you!!
This isn't a real answer (It's a quick and careless answer at best, so don't take it too seriously)
But I just thought I'd mention that the the W3C markup validator might be useful to you if you don't already know about it.. It catches bad markup practices or errors on your page and can give you more information on how to fix them. At the time of writing, your front page alone has 10 errors and 3 warnings on it. Maybe this could point you in the right direction?
upon a quick skim of your page you don't seem to be utilising CSS properly. That is to say, that I see you are using css but you have elements on your page (use of <center> HTML tags, inline styling and things like that) that go against the grain of why CSS was invented.
If you haven't already seen the CSS zen garden, take a quick read/look at it. It should set you right on why we use CSS instead of tables and alignment tags.
(People sometimes don't get this immediately, but , click the links on the right in the zen garden. The same HTML and page content are completely restyled using one html file and seperate CSS sheets)
Good luck!
Edit:
Oh, I almost forgot to mention that internet explorer 8 doesn't have much (if at all) HTML5 compatibility. If you want to develop websites and web apps in HTML5 you'll be hard pressed to serve your I.E 8 visitors and may end up spending more time fixing bugs than you are developing the content.
Some developers are already boycotting I.E 8 entirely to usher in the new era of the web with HTML5 and CSS 3. There are a few js compatibility libraries out there (like excanvas for the new <canvas> element for example) but they don't work flawlessly and you will eventually have to draw the line somewhere. (lol. canvas.. draw line.. get it?) That being said, i did find this article and this may be useful to you:
turn-on-html5-in-ie8-or-lower
Not every website requires HTML5 and it's new technologies, but if you plan on using it for things like the <canvas> tag, Id suggest (from my own personal opinion) you forget about I.E 8 and concentrate on browsers that utilise it.
Remember that you can make checks in your HTML to see what browser version your visitor is using.
You can see if they are using an incompatible browser, and if so, you can then alert them that their software is out of date and suggest to them alternatives (such as chrome or firefox)
There's a bunch of tutorials on-line about this, here's the first decent looking one I found in a quick Google search this article covers using this technique for seperate CSS sheets but there are others that talk about the problem I mentioned in more depth and I'm sure you can probably figure out how to do it anyway once you read the article.
Either way, I'd say you've got a little bit of reading ahead of you to understand why your humble website does not work in an increasingly obsolete browser.
Again, good luck to you in your future endeavours.
Edit was too harsh:
Having looked a the site I would start by suggesting in future you think about design from a users perspective - the colour scheme you're using isn't very friendly on the eye, the red text against the green is particular troublesome to people with red/green color blindness, you also should consider how your content is presented.
End Edit:
However, regarding your IE issues.
First things first, with any work is getting a firm plan of what you hope to achieve and setting a good groundwork before starting. With HTML that means leveling the playing field with regard to browser quirks, and to achieve that, you use a reset css file.
This ensures that all browsers (as close as possible) behave in more or less the same way, regarding padding, spacing, line heights etc, and can go along way to prevent these sort of problems from happening, and allow you to achieve consitancy.
There's more info at the link below.
http://meyerweb.com/eric/tools/css/reset/
Secondly your HTML version - your declaring HTML5 but then use HTML4 values and attributes - basically your site (as pointed out above) is not valid markup.
Hello every one i had created a website using dreamweaver in windows7 which worked good in my system.I opened the same html site in another system with operating system windows xp and even in windows 7, but all the alignments of images ,textfields ,buttons and header image,content etc everything has been changed.what might be the problem.Can any one help me in solving this problem.Your answer will be most precious thing to me.Thanks to every one whose going to spend time on reading this question.
Without knowing more details it's hard to properly answer your question. Going to take a shot in the dark about a common issue.
If you did it in Dreamweaver you probably used its interface to drag and drop div elements around to place them in exactly the right positions. The problem with this method is that DW will use positioning relative to your screen size and it might not show up too well on other resolutions.
The solution to this is to make sure you code your containers correctly and not have a look at DW's CSS to fix it.
Without the HTML of your page (post it in pastebin and link it here), can't give a better answer.
Make sure you VALIDATE your code. In my experience using dreaweaver, the doctype declaration and the order of the tags can affect image positioning.
That was because you used different browser. In using Dreamweaver, try to not leave default values. For better debug you should code it with HTML and CSS. Those are not programming languages because they don't need exactly programming knownledge.
A really good HTML lessons at w3c.
A really good CSS lessons at w3c.
Let me begin this topic by explaining my background experience with web design. I have always been more of a back end programmer, with PHP and SQL and things. However I do have a shallow background with HTML and CSS. The problem is, I don't know it all. What I do know is, when it comes to designing (not back end dirty work) I understand basic CSS properties and I also understand HTML and I can usually throw together a sloppy web page with the two and a couple bazillion DIV tags.
Anyways..
The problem I always have encountered is that when I design a website in a browser such as IE7 (and then it looks perfect on IE7), and then look at it on IE8 or IE6 or Mozilla (etc.) it gets all spacey and ugly and looks totally different than the way it should look on IE7.
Question one:
Basically, what I am asking everyone is what route should I take to learn how to properly build the website? Build as in put it togehter with CSS standards and HTML standards that will make my site look the same on every brwoser. (Not only learning standards but where can I learn to properly write my code?) Where is a strong free resource I can use to learn how to these things?
Question two:
How do I properly code my website? Do I use all external style sheets to make dynamic page design simplistic or do I hard code some things into the DIV tags on each page? What is proper?
Oh, and if anyone has any tutorials on how to properly design a complete layout feel free to throw it in a response somewhere.
Thank you for taking the time to read my questions, and hopefully you will understand what I am trying to get out to everyone. I need to get on the right route of the designing side of web programming so that I will know how to create successful websites in the future.
Thank you,
Sam Pardee
First, I recommend NOT starting with IE as your "development" browser. Start in Firefox, say (which gives you the advantage of tools such as Firebug and the web developer toolbar), and then get it right in IE afterwards.
Second, definitely user external style sheets; it results in much cleaner code and a much simpler way to make style updates. Definitely recommended. Also external CSS files can be cached by the browser, so they won't increase the page download size as users go from page to page in your site or application.
Lastly, start by defining your content using simple HTML, basing the structure on the meaning of the content (often called "semantic" HTML), not on how you want it to look. Use a <ul> tag for something that is a list of items, for example, even if you don't want to display it as a "bullet list" (the default styling for <ul>). Then start adding styles to make it look right. This will result in very clean HTML that can support a variety of formats and layouts (take a look at CSS Zen Garden to see what I mean) and will also help push you towards a layout that reflects the structure of your content, which will be easier to read and comprehend.
In terms of books, you can't go wrong with Eric Meyer. HTML is easy, of course, and I don't recommend doing fancy stuff with HTML, so put your learning effort into CSS (Eric is the CSS guru).
Cross-browser compatibility is always an issue. It's a staple of web development, sadly, and there is no magic bullet. Luckily, the main offender, IE6, is finally starting to fade.
A1.
When starting work on a new site, first take every piece of content that needs to be on the page and paste it into a text file. Then put it in a rational order (thinking "If I had to use a text browser to use this page, how would I want it to be arranged...").
Then start wrapping HTML tags around each piece of content. For each piece, think "What type of information is this?" A heading? h1/h2/etc tags. A paragraph? A quote? A table? p,quote,table. Essentially, use HTML tags that describe what kind of information each piece of content is. When I do this, I pay no attention to how it actually looks in the browser at this point.
Once the content is all marked up, begin writing the CSS. If at all possible, try not to touch the markup during this step. Sometimes that isn't possible, though, and throwing a div or span around some elements is unavoidable. The less meaningless markup, the better.
In my experience, this approach keeps things very clean and tidy, and makes debugging layout issues a lot easier.
A2.
Building the styles into your markup using the "style" attribute is fine for prototyping, but beware, the temptation to leave them there once it works is strong. The best practice is to have all of your styles in external stylesheets. I'm interested to hear any alternative viewpoints.
Some great web standards/CSS resources:
http://www.csszengarden.com/
http://www.alistapart.com/
http://www.thenoodleincident.com/
http://www.quirksmode.org/css/contents.html (useful reference for selector-compatibility)
http://centricle.com/ref/css/filters/ (good reference for css hack compatibility)
http://www.zeldman.com/
http://meyerweb.com/
Hope this helps!
There are TOO many site out there that have really great tutorials for HTML and CSS. They will give you all of the information you are asking for. I would start doing some reading of the great gurus of HTML/CSS:
Simon Collison
Andy Budd
Molly Holschzag
Dan Cederholm
Jason Santa Maria
Eric Meyer
Jeffrey Zeldman
Cameron Moll
Any book or article you can fond from these folks will steer you in the right direction; you can't go wrong!
As for sites that will give you the proper methods/concepts/training for web standards compliant sites:
http://www.w3schools.com/default.asp
http://www.webstandards.org/
http://www.smashingmagazine.com/
http://www.webdesignpractices.com/
http://www.designmeltdown.com/default.aspx
http://www.cameronmoll.com/
http://www.alistapart.com/
http://www.cssnewbie.com/
http://www.css3.com/
http://htmldog.com/
http://css-tricks.com/
http://simplebits.com/
http://www.colly.com/
http://glish.com/css/#tutorials
http://meyerweb.com/
http://jasonsantamaria.com/
The one of the best books I've bought so far to help with HTML and CSS coding PROPERLY is Beginning CSS Web Development by Simon Collison. Great, easy to understand, and not too slow. Great examples to follow along. After that, buy CSS Mastery - Advanced Web Standards Solutions, also by Simon Collison, and Andy Budd and Cameron Moll. This book gets you up to speed with some advanced techniques that you'll see on the many of the web sites right now, some of which were invented by the authors.
The Separation of Layout and Content is the domain of CSS and HTML - so far well understood. Now about separating...
I'm looking for hints and Best Practices to get started with the task of providing a "skin" or "theme" for a content management system.
Background:
We are starting to embrace a Portal Server/Content Management System and are starting to change the look and feel to match our needs.
Our designer has so far mainly worked with full control over HTML and CSS, tweaking either one in order to get pixelperfect layout. With adoption of the cms there's a lot precreated HTML (very semantic, almost no tables :) that needs to be skinned with CSS and Images. Though it is possible to change the HTML fragments, I'd prefer to do so only as a last resort.
As this provides the challenge of "how to get started" my question is about any tipps how to proceed or articles that can help managing or organizing this task - e.g. best practices in designing, how to slice this task or what tool to use.
It seems bad practice to just save a dynamically generated page to disk and make changes locally. This would be somewhat ok for the CSS files but changes to HTML elements must be retrofitted to the fragments that they are generated from. I'd like to keep this out of the designer's realm if possible. Also, the thought of Dreamweaver (or any similar tool) making implicit tweaks to the HTML structure is frightening for me.
For the curious: The mentioned CMS/Portalserver is Liferay, but the question is really language- and tool-agnostic.
Edit: FireBug (as Josh suggested) is awesome for trying on-the-fly changes to css. Is there more - either in the area of tools or in-process and self-organization?
If you're looking for practical examples of separating style and content, then I'd suggestion the CSS Zen Garden. Trawling through the HTML and CSS is inspirational and enlightening and should help with what you're trying to do.
My #1 tip would be be to make everything as semantic as possible and use lots of classes and ids to hook your styles onto.
Usually, Whenever I am in a situation Like this, I bring up the page in FireFox, inspect the different elements using FireBug and see exactly what css is applied to them. THen I'l just modify the existing css until I get what I like. You can even play around in firebug and modify the CSS without "saving" those changes.
Have look at CSS Tidy, we normally use this to clean up the CSS and reorganise for development and production. However, I personally prefer writing HTML/CSS by hand before using this. It is just a matter of individual preference I guess.