As for pseudo-elements :after/:before there are apparently two ways if I want to display image there:
using background-image:url(imgurl.png);
using content:url(imgurl.png);
Are both ways correct and valid? Why should I be using one way over another?
Apparently using the second method you cannot set the picture properties like size. But first method is generaly more taught on internet.
Ideas?
It depends on what your image is, just like the debate between using an <img> tag vs using background-image in your CSS.
If your image is part of your page's content, use content:url(imgurl.png);. Certainly if you want the images to be interactive or to to inform the user's experience while on your page, use content. If your image is just stylistic for your site's visual design, use background-image:url(imgurl.png);
Also, do note that you should use double colons: ::before and ::after. Only IE8 requires the single-colon versions.
Related
I've spent the past 60 minutes looking for a property that does to the image tag what "background-attachement: fixed" does to a background image.
I know for a fact this property exists, I used it once 6 months ago. I found out about it when I found out about "object-fit: cover" for the image tag.
I've no idea how to further describe it. I'm hoping that someone in here knows what I'm talking about.
Here's a video explanation: https://www.loom.com/share/b5f7652d60994d9392c7fa00dc8b260e
At this point, finding that property (that may not even exist and I'm wrong about it) is a time sink. So, I'm giving up and wrapping this up.
There are 2 options to achieve the effect.
Use a background-image on a div tag with "background-attachement:fixed" like I did in this loom video https://www.loom.com/share/b5f7652d60994d9392c7fa00dc8b260e
Use the clip-path trick mentioned in this other question How to use CSS background-attachment in <img> tag?
I personally will go for #1, because it is cleaner to implement in my Tailwind + Next.js codebase.
But #2 works just as well and it allows you to use the image tag. Using the image tag has the benefits of easy lazy-loading and slightly better SEO.
Before I implement these to my site, just wanted to know if someone has any negative experience using :before and :after to design. (or outweighing positive aspects)
Well, by using pseudo element, you make it more semantic. You don't need to create empty element just for layout purposes.
The cons, I believe some legacy browsers won't support it, but you can use polyfill for that.
Say if you have a site like SO which has multple answers on each page. If you want to add an image/icon after each answer you could have something like
answercell.post-text:after {
content: url(images/disclaimer.gif);
}
that way you can update the entire site without having to change a single HTML/ASPX page
So it makes site wide updates easier.
Addtionally it would reduce the page size in (Kb) as you would require less HTML so the page would load faster.
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
Okay, so this is more of a question that has lots of solutions that are not CSS, but I'm looking for doing this more from a theoretical perspective. I have an application for it, but its not worth coding it out in any other way.
The (Fun) Question
How do you color the text of an element using the text of the element? I have an element, all on it's own, which will contain a hex value for a color, and I want the text to be that color, but I want to do it only using CSS (likely only can be done using CSS 3).
Sample HTML
<div class="color_contents">#0000FF</div>
So, I've tried to use the attr() with no success, but I'm not sure I'm using the right contents (I've tried text, textContent, and innerText to no avail). Doesn't need to be cross-browser, but just a way to accomplish it.
Currently, there is no way to use CSS to access an element's text content, not even with the CSS3 modules available today.
Regarding this:
So, I've tried to use the attr() with no success, but I'm not sure I'm using the right contents (I've tried text, textContent, and innerText to no avail). Doesn't need to be cross-browser, but just a way to accomplish it.
attr() only looks at element attributes (foo="bar"). Since text content isn't an attribute of an HTML element (despite being a member of the corresponding DOM object), you can't query for it using that function.
There isn't a similar function for accessing an element's text content.
You could do something like this. It's a bit hacky, but all CSS
div.color_0000FF:before{
color:#0000FF;
content: "#0000FF";
}
HTML
<div class="color_0000FF"></div>
Example: http://jsfiddle.net/s8vLy/
The content/attr CSS properties can only be used with :before and :after pseudo-elements.
CSS3 will support attr access from other properties, see https://developer.mozilla.org/en/CSS/attr.
However when/if CSS3 attr goes live, you will still not be able to acces the "contents" of a element from CSS, simply because thats not what CSS is designed for.
Bottom line, use javascript :)
I am developing a web application and want to block selection of any text on the web page for the user. Personally I do not like add any Javascript for this. Is it doable using CSS only?
Thanks in advance.
I believe there are css3 rules (e.g. the user-select property) but at the time of writing they are not supported in all browsers. If you're looking for tricks, here is one:
Create an overlay DIV that is same size as the disabled DIV and place it over the disabled DIV using CSS positioning. You can use simple CSS or fall back to JavaScript if you have problems in calculating width, height or position. This could be annoying for the user by the way.
demo here