I just came up with this, it seems to work in all modern browsers, I just tested it then on (IE8/compatibility, Chrome, Safari, Moz)
HTML
<img id="my_image" alt="my text" src="images/small_transparent.gif" />
CSS
#my_image{
background-image:url('images/my_image.png');
width:100px;
height:100px;}
Pro's:
image alt text is best-practice for accessibility/seo
no extra HTML markup, and the css is pretty minimal too
gets around the css on/images off issue where "text-indent" techniques hide text from low bandwidth users
The biggest disadvantage that I can think of is the css off/images on situation, because you'll only send a transparent gif.
I'd like to know, who uses images without stylesheets? some kind of mobile phone or something?
I'm making some sites for clients in regional Australia (hundreds of km from the nearest city), where many users will be suffering from dial-up connections, and often outdated browsers too, so the "images off" issue is an important consideration.
are there any other side effects with this technique that I haven't considered?
edit: Just wanted to add the extra info that I'd use this over a normal image tag because
A. I can use css-sprites
B. I can generate css with php that alternates background-image sources between different sub-domains using a single array
C. I like the way that resizing the image now doesn't stretch or distort it so it behaves like everything else on the page.
What is wrong with normal image tags? img tags are meant to be used when your content has images in it, and CSS shouldn't take any part in what the actual content is. On the other hand, presentational images should be set as background-images to divs and such and then handled via CSS so that they don't interfere with the content and structural markup.
There's no scenario where you'd need to do something like that.
If you want an image replacement technology that degrades gracefully when CSS is off, you can use the old faithful text-indent technique:
#element {
width: 100px;
height: 100px;
background: image(pic.jpg);
text-indent: -9999px;
}
<div id="element">This text will show if CSS is off, otherwise an image is displayed.</div>
Tatu is right, though you don't seem to need indent. Just put the image you want as the src of img. Then you get text when images are off (and note that alt text can styled using CSS on img), and have the image displayed when they are being fetched.
The big thing about 'image replacement methods' is because people want the text out of the alt attribute when you are styling headings so they get search-indexed correctly. img on its own though will do the job without any CSS or additional markup.
Well I use this kind of technique in h1/h2 tags when clients want strange fonts. Heres how I do it http://flowdev.tumblr.com/post/1187111884/the-power-of-h1-and-h2-tags
Works in all browser as far as I know.
Related
From what I understand Gmail doesn't accept CSS blocks in the head at all, which is why I have been adding a bunch of inline CSS to my email template to make it work.
However, I'm struggling with the CSS positioning property. I want an image to sit on top of a background image so I set the parent div of both to position: relative and the image to absolute. However, for some reason Gmail removes the style attribute that declares the position: relative from the div. It keeps all other inline CSS though.
Any idea? Any workaround?
Sadly, I suspect you may have to abandon your perfectly reasonable ideas of divs and positioning when designing for email. CSS support in email clients is a tangled nightmare.
The only (relatively) surefire way of forcing layout on email is to go with an old school tables layout, which is unfortunate, but unavoidable.
Campaign Monitor has an excellent summary of email client CSS support here.
I experienced similar layout problems when sending email newsletters. The solution was to use tables to position things properly. It's dated, but I think it was the only way to make things look the way they should.
I'm working on a table that has cells requiring a background with lowered opacity, and text on top not effected by the background. The content in the cells is dynamic.
http://jsfiddle.net/6zszm/3/
In IE9 (have not tested in other IE versions) the background is clipped at the span content. In firefox, the background runs wild and overflows to bottom right. In chrome this works like a charm.
Some similar questions that didn't quite cover it:
How to make <div> fill <td> height
Someone suggests a 1px height to the td - this did not work for me, nothing changed. I would also rather not use JS to fix this problem.
Another somewhat related issue: CSS absolute positioning bug with IE9
The strange thing is in IE9, this worked in compatibility mode, but not without.
This is indeed seemingly impossible - unless you specifically define each cell's width and height, which kind of defeats the object of using a table.
Possbile solutions...
RGBA
Assuming you are going to use background colours you can always use background-color: rgba(200,200,200,0.5) with a fallback to solid colours if it fails. Support for RGBA is in all of the top browsers, it doesn't work for IE8 and below however...
Transparent PNGs
The obvious easy one is to fallback to using transparent PNGs, but then this relies on the colours you are using being predefined and rather rigid.
Use -moz-element
Another mad solution to get FireFox to work (if you are using background images rather than colours) would be to use the background: moz-element() ability. Here you create hidden elements on your page of each different opacity that you might require and reference them as a background via id. For example:
<div id="image1" style="background: url(image1.jpg); opacity: 0.5;"></div>
Then reference that on the element you want the background to appear on:
<td style="background: -moz-element(#image1);"></td>
I'm not vouching for this method however, it's rather inelegant and browser specific. Tbh I'm quite suprised to find that this problem is indeed not fixable (esp. in FF) using plain old absolute and relative tricks.
Don't us Tables
The more browser supported solution by far would be to drop using tables and recreate a table structure using good old divs and floats. The only problem with this solution is again you'd have to define most widths and heights and you wouldn't be able to achieve vertical cell alignments unless you fallback to something even more experimental like FlexBox.
You could try working with a CSS framework, like LESS or Blueprint. Most frameworks have background code that makes your styling look the same in all browsers, even if tweaking would normally be required.
As a purely aesthetical design thing, I'm wondering if it's possible to have an element with a non-opaque background blur out the content behind it.
More specifically, when I have a modal box appear (as part of my custom alert/confirm/prompt setup), currently the background content is "faded" by having a mask over the screen the same colour as the document's background.
What I'd like to do is apply a small amount of blur (just a few pixels) to the masked content to further direct attention to the modal box.
Browser compatibility is not an issue, since as I mentioned it's purely aesthetical. Preferably I'd like it to work in IE9 as a minimum, and Chrome if possible.
Also, no jQuery. By all means, provide an answer in jQuery if you want, but I'll be translating it to raw JS before letting it near my site.
Nowadays you can use the backdrop-filter CSS Property.
CSS:
.modal {
backdrop-filter: blur(10px);
}
Not possible with pure CSS..
You could use (with its limitations) the html2canvas script to render the pages to a canvas.
Then blur that image or the part you want with http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html
Use the toDataUrl to get the image and use it as a background to your popup...
It is quite an involved process and requires a lot of javascript, but i believe it to be the only way to do it...
This would require javascript (and fairly complex javascript).
From what I understand, it sounds like you're trying to create an 'Aero glass' effect where the content behind a semitransparent element is given a blurred effect. It is not possible with HTML and CSS alone (unless you consider using IE-only filters).
At the moment, there aren't any CSS properties that can dynamically apply image filters like you're describing.
The html2canvas solution presented by Gaby is potentially overkill. You can get the same effect with an iframe of the same website that has been blured (via filter blur or another technique - "-webkit-filter: blur(2px)" only works in chrome as far as I know.
This said, I'd say both solutions are really really hacky and I'd personally never use either myself. I tried this out just to see if it was possible at all out of curiosity.
See a (chrome only) example here: https://s3.amazonaws.com/blur-demo/index.html
i have a blog and i have placed a form in right but it shows different result in different browser.
The Link named "Subcribe in a reader" should be in center but it shows in left in Safari and Opera but IN FF and Ie7 Shows Perfectly in center.
And The border is 5-6 pixel going up in Opera and Safari but in FF & IE 7 it shows Perfectly fine. And In Ie6 it shows border line 10-12 pixel downside ... strange
i m using this code to adjust for postioning..
please help....
my blog : ww.techieinspire.blogspot.com
check image here
http://techie2inspire.googlepages.com/csspositioningproblem.JPG
Your markup is seriously jacked up. Use Firebug on Firefox to look at it. Here's a couple things I noticed:
You have your elements for your subscribe link inside the form above it. This is not apart of your newsletter form, so shouldn't be contained inside that form.
Your using a lot of <span>s with block elements inside them. <span>s are generally for inline content and sticking block elements (like <p>) inside could give weird results.
Check your stylesheets where your setting the left padding for ".newsletter p" this is affecting your subscription link.
Try to avoid specifying styles inline (using the style attribute).
Stop using postion:relative everywhere. Instead using padding and margins for layout your sidebar.
Generally to center something, you can do this:
.centered_thing {
margin: 0 auto;
text-align: center;
}
Edit: The marquee thing is terrible. Read about what happened to the HTML marquee tag. There's many good reasons to avoid it or Javascript knockoffs.
I have a small gallery of thumbnails. When I place my mouse pointer over a thumbnail image I'd like to have a full size image pop up in a div in the top right of the screen. I've seen this done using just CSS and I'd like to go down that route rather than use javascript if possible.
Pure CSS Popups2, from the same site that brings us Complexspiral. Note that this example is using actual navigational links as the rolled-over element. If you don't want that, it may cause some stickiness regarding versions of IE.
The basic technique is to stick each image inside a link tag with an actual href (Otherwise some IE versions will neglect :hover)
Text <img class="popup" src="pic.gif" />
and position it cleverly using absolute position. Hide the image initially
a img.popup { display: none }
and then on the link rollover, set it up to appear.
a:hover img.popup { display: block }
That's the basic technique, but there are always going to be major positioning limitations since the image tag dwells inside the link tag. See the link for details; he uses something a little more tricky than display: none to hide the image.
CSS Playground uses pure CSS for this type of thing, one of the demos is surely to help you and as it's all CSS just view source to learn - you probably want to use the :hover pseudo class but there are limitations to it depending on your browser targeting.
Eric Meyer's Pure CSS Popups 2 demo sounds similar enough to what you want.
Here are a few examples:
CSS Image gallery
Cross Browser Multi-Page Photograph Gallery
A CSS-only Image Gallery: Explained
A CSS-only Image Gallery: Example
This last one acts upon click. Just to be complete in behaviours.