How does CSS works under the hood? [closed] - css

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I would like to know how css works under the hood.
Whether the html that gets download will be interpreted before CSS's interpretation or after?
Or it will apply as soon as DOM has been constructed by the browser. Please give me detailed clarification on this.

An HTML page is parsed the order it is built. if the CSS is parsed already, the elements that have styles in that parsed CSS will get styled immediately when they are laid in the page. That's why CSS is preferrably loaded in the <head> - before the tags in the body get a chance of being painted to the page.
if you load the CSS late, then elements will be shown in their "unstyled form" until their styles (it any) are parsed. this is what's known as "FUOC" or "Flash Of Unstyled Content"

This page provides many details about that.
http://www.westciv.com/style_master/academy/css_tutorial/introduction/how_they_work.html
http://www.westciv.com/style_master/academy/css_tutorial/introduction/what_are_ss.html

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How to apply CSS to external iframe? [closed]

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I have been taught that one can not apply CSS to cross origin iframes, but I have found that Stylebot applies CSS to iframes successfully with no problem at all.
How is this possible?
Is there any chance I can do the same in my website?
You can't apply custom CSS to cross-origin iframe ( you can only if you have direct access to the both servers )
But..
Extensions can avoid those rules because files in extensions have different policy rules. So basically you can add a JavaScript file to each and every page or iframe. And from there you can basically do anything. And this JavaScript file that was injected by your extension will never be blocked. Each and every browser has its own API, about Chrome's way of doing things you can read here :
https://developer.chrome.com/extensions/content_scripts
About extensions you can read here:
https://developer.chrome.com/extensions/getstarted

Cant style Facebook share button as its in an iframe? [closed]

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Is it possible to use CSS to style the facebook share button? The problem im having is that the javascript creates an iframe meaning normal CSS on the page doenst affect the styling of the iframe.
https://developers.facebook.com/docs/plugins/share-button/
According to the Facebook Do's and Don'ts, you are not allowed to
Modify Facebook brand assets in any way, such as by changing the design or color
So I guess that settles the matter.
Should you really want to customize the content of an iframe, the question has already been asked multiple times: check out this answer, or that answer or even that one.

Using (parts of) Wordpress Themes in xpages [closed]

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Not sure if this is a stupid question or not,
but i want to create a better looking notes database which should remind users of our companys homepage.
Is it possible to use codes extracts of the wordpress themes css code?!
It might be easier to start with the Bootstrap4 XPages plugin on openNTF and then work to skin that.
As long as CSS stylesheets don't reference by element ID, it's possible to utilise elements. However, bear in mind that parts of the CSS stylesheets you're using may get overwritten by inline styles or stylesheets from the XPages runtime itself. In my experience, you will usually need to make some modifications to the stylesheets your using, but it's doable.

how to download an imported style sheet from a website? [closed]

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I often need to use some styles from a website but i cant find those style sheets since it is linked using an import function. can anyone say how to download/view those imported style sheets.
Here is what you can do. Depending on which browser you use you can activate developer tools in the settings. You can then right klick on a part of the website you want to have the styles from and often times it says something like "inspect element" in the menu. You will then be able to view the styles that are applied to this specific element or webpage and you will also be able to copy those to the clipboard.
I actually hope this will be of help to you.
https://developers.google.com/chrome-developer-tools/

Responsive design best practice: Duplicate html elements for media querying and SEO impact? [closed]

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EDIT : Question closed, see webmasters.stackexchange:
https://webmasters.stackexchange.com/questions/43038/responsive-design-best-practice-duplicate-html-elements-for-media-querying-and/43100#43100
I have a page with, in order of html appearance, a figure tag, headgroup tag, and an article tag.
In order to make a page's design responsive using media queries, I need a different order for elements, so the image appears after the title.
The simplest solution I can think of is cloning the headgroup tag in the source code and place the copy before the figure tag, thus making it possible to show/hide the appropriate tag according to viewport size.
But I have the feeling this is not ideal SEO-wise.
My question is simple:
Does this simple technique really have an impact on SEO?
Is there an html attribute to declare duplicate elements in a page?
Is there another recommended solution? Best practice?
Thanks in advance for any advised input!

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