I have an SVG <filter> defined in the HTML document body, which I use to apply a texture to other elements via their respective CSS filter: rules. Everything works correctly. ✨
Is there any way to set the <feTurbulence> element's seed attribute via the CSS at the point the filter is applied, so that I could provide a CSS counter as the value?
I know how to do this via JavaScript; I'm wondering whether it's possible via HTML/CSS/SVG alone.
Thanks!
Related
Are there a css property that would change nothing?
I need this for testing purposes very often when writing scss just to see that I created a css selector correctly. For instance, I would be glad to have something like this foo: "helloworld1"; and later on I would be able to change the value of the foo and check the value in the developer tools to see that my selectors have indeed reached a correct element.
I thought about using the width: auto;, but sometimes the width is specified (e.g. width: 100px;).
Define your own properties using custom properties (aka CSS variables)
Custom properties are solely for use by authors and users; CSS will never give them a meaning beyond what is presented here.
Also
Custom properties are ordinary properties, so they can be declared on any element, are resolved with the normal inheritance and cascade rules, can be made conditional with #media and other conditional rules, can be used in HTML’s style attribute, can be read or set using the CSSOM, etc.
Using only CSS, is there any way to determine if a selected HTML element has a specific CSS property set?
As an example, if we have CSS of:
.example { color: red }
Is there any way in CSS to select div[color has been set via CSS]? (that's obviously pseudo-code, not real CSS)
This is trivial to accomplish when the HTML includes the style inline, but I am only asking about when the style is not defined inline within the HTML.
Unfortunately not, currently that can only target attributes on a tag, not styles that have been applied to it.
If you maybe describe what you are trying to do, there maybe an alternate way to achieve what you are trying to do.
I'm looking for a way to use a pure CSS selector (not script) to select an element's attribute, not the element itself. I know XPath can do it but can a CSS selector?
Example, given:
<img alt="image" src="photo.jpg">
Can I get to the src attribute with a CSS selector?
Update:
I don't want to set any element's values, I just want to select the text "photo.jpg".
Because CSS selectors originated as a fundamental part of CSS, and CSS can only apply styles to elements (since attributes are just element metadata, not standalone objects), CSS selectors cannot match attributes alone within CSS.
But I suspect you're not actually asking about CSS here. You're asking about selectors alone. You're probably using a web automation tool such as Selenium or one of the numerous HTML parsing libraries out there that support either CSS selectors or XPath. Some of these libraries support non-element selectors in the form of pseudo-elements such as ::attr() (I don't remember which ones), you haven't mentioned which tool you're using so I can't tell you for sure if you could use it. Note that this is not the same thing as the CSS attr() function mentioned in the comments — that is a CSS function, which is a value, not a selector, and therefore it cannot be used in a selector.
But if your library doesn't have such a feature then you'll need to either select the img element directly and query its src attribute separately (again, how you do this depends entirely on what you're using, which is why it helps to be specific about this sort of thing), or use XPath if possible.
CSS Tricks has an article that I believe answers your question:
https://css-tricks.com/almanac/selectors/a/attribute/
If you are trying to set the value of a certain element attribute using css, I'm pretty certain that is impossible for anything other than the content property.
CSS is not a programming language and can't process data.
Its sole purpose it to tell the browser how a certain element should look like, like in coloring a text red.
To process data in a web page you use javascript, which can make use of CSS rules though, to grab a certain type of elements in a web page, for example this, which will return a list of all elements of type img
var imglist = document.querySelectorAll('img');
Now, having a list you can loop through it and get each src like this
Array.prototype.slice.call(document.querySelectorAll("img")).forEach(function(img) {
var imgsrc = img.src;
// imgsrc now holds the image url, in your case "photo.jpg"
});
considering I have a single css file for my entire website (and that doing so is an usual technique), I was wondering if there is a way to select website-wide attributes like body (or any other attribute in fact) according to the current page using only css.
Something like
body:in('index.html') {
some properties;
}
body:in('contact.html') {
other properties;
}
Again, css only. I know the simple solutions using things like php, js, jquery...
Selectors have no information about the document beyond what is presented in the DOM tree, and the DOM does not expose information about the page according to its file name, URL, or any other such properties.
Historically there was a #document at-rule for querying the current URL, but it was removed from the Conditional Rules Level 3 module. The most likely reason for this is the lack of cross-vendor implementations, as the only known implementation exists in Gecko, as #-moz-document. It's so bad, that the only uses for it that you'll spot in the wild are not to apply CSS based on a certain page, but solely as a CSS hack for Firefox.
As you've stated, the simplest workaround for this is to have each page apply a unique class to the html or body element and select according to that class, whether via hardcoding, or dynamically.
you could add and id atribute to the body tag and style things inside it using:
body#contact div{
background:#376;
color:#857;
/*etc*/
}
more information about selectors in http://www.w3.org/TR/css3-selectors/
I want to know what things can be done "ONLY" with CSS , that are not available using dynamically updated style "attributes" using Javascript. So far I know:
Media queries
Pseudo tags
Any more?
Update:
This question was closed but I asked it as I am trying to decide on the technology to use for a project, but one of the options cannot use CSS style sheets, and can only manipulate the style attribute using javascript.
Inline style attributes can only contain property declarations (e.g. width: 10px or color: red). They can't contain any other CSS constructs: not selectors, at-rules (e.g. #import, #media, #font-face), etc. Just property declarations.
However, they play a big role in the cascade: any styles for an element with that attribute take highest precedence (after considering !important of course).
There's actually an entire module devoted to style attributes, by the way, but it's not essential reading for authors.
So, anything that isn't a CSS declaration, is only possible in a stylesheet, not a style attribute. Not sure if that's what you're asking...
Note that media queries and #media rules are not the same thing; media queries can exist in areas outside of stylesheets too, like HTML's media attribute, where they're next most commonly found.
I believe pseudo classes (:hover etc..) and pseudo elements (:after, :before) cannot be added/manipulated via JS (via the style property i mean) because they are not part of the DOM.