What is invalid about css selector using :is() [closed] - css

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so I started trying to use :is() pseudo selector for a project I'm working on. the queries I was writing though do no seem to be working.
:is(.column-1,.column-3,.column-5,.column-7) .gallery__item:nth-child(1)
I ran each query through document.querySelector, and it came back with error telling me that it's an invalid selector. tried to refactor my selectors but I haven't had much luck. any idea what I am doing wrong here?

As of now, CSS selector :is() isn't supported by most browsers, see Can I use...

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I have a CSS specificity [closed]

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This is my html code
This is my css code
When in CSS I write the CSS code for .keys class like this and add class .transistionOfKeys to html then my border properties does not add to it
But when I change my CSS code to this by removing .container and just keeping it to .keys then it works
after changing CSS code
So I want to know reason for this...
Hope someone answer this question soon...
Change the selector for the second rule to .container .transistionOfKeys {...} to achieve the same CSS specifity as the first CSS rule.

My CSS stops working when I try use use the HTML5 tag [closed]

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My CSS style stops working when I put the tag <!DOCTYPE html> to use HTML5. I used divs to separate the different styles in my pages, and used IDs to identify each one on the CSS code. Everything works fine but when I use that tag, it stops working. Anyone can help with this? Thank you!
you did not use the "px" unit in the code you posted, like width:270px; Changing/completing this should help.

First character of span disappears only in Chrome [closed]

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Chrome was the only browser to pick up the :first-letter in my CSS. Solved
Found this selector which is hiding it.
.old-price:first-letter {
visibility: hidden;
}
You can find it yourself in the chrome developer toolbar.

Textbox color does not persist on focus [closed]

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Closed 8 years ago.
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I have created css button style as here: http://jsfiddle.net/karimkhan/SgTy2/
When I used same css insite <style> in my page then it's effect changed. looks like below:
Actual css on fiddle gives this kind of view:
I am not good at css. What's wrong I am doing here?
What if you make an external css file? The same will probably happen, so see what styles are overlapping your element in inspector mode. I would not suggest to use !important, but rather make the style have more priority. One way to do this is to make your css selector more specific.
For example:
input[name="url"]
{
background: black;
}
has more priority as
input
{
background: red;
}
jsFiddle
Note that a more specifc path also takes longer to determ.
Hope you can work on a solution now.

Why won't the background color apply? [closed]

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I know the solution has to be trivial, but I am just not able to figure out why the background color from my class ('highlight') is not applying to the links marked 'sniff it here'. Sometimes it seems to apply for a moment, and then disappears. See the page here:
http://www.foodsniffr.com/blog/pumpkin-cranberry-oatmeal-cookies-vegan-vegetarian-gluten-free-healthy/
Thats weird. The included light.css (which has the .highlight style) gets rewritten to I.light.css.pagespeed.cf.kioUqT0sFU.css (which lacks that style), while the style.css isn't rewritten and throws a 404. I am assuming it's a caching problem of Wordpress, and not related to CSS.

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