Develop Reference

Unexplainable CSS Positioning Issue Somehow Related To Transitions

I know that this is not a 'good question' to pose—but I'm desperate by now and need to find some inspiration.
I have a questionnaire page/web-app that uses CSS transitions to slide to the next page of questions/options.
It is well-tested and the transitions in question aren't complex.
But the transition to one special page went out of control recently. And although I consider myself well versed in CSS and JavaScript I'm totally lost with this problem.
The construct in question works like this:
I have a 'window' that is positioned absolutely and has its overflow hidden.
Inside that is a page container positioned relative to no left or top values or transforms given.
The pages inside this container are positioned absolutely according to their status classes positioned on the left: 0 (active), left 100% (not yet shown), and left: -100% (already done)
What happens now is that when I switch classes to show a certain page, the page container 'jumps to the left'. In Chrome nearly -100% in Firefox about -70% same in Safari.
Those values are my guess because when I open the dev-tools, nothing is to be found in the styles, in the computed values anywhere.
When I move back to the previous page the container jumps back to its original position, and if I move again to the critical page it stays.
I do no positioning whatsoever with JavaScript anywhere, I only switch classes on HTML elements.
After hours of experimenting back and forth, I found out that the problem is in some way JavaScript-related anyhow.
Using the exact same CSS and HTML with a slightly older version of JavaScript does not show the strange behavior. The changes in the Script are mostly ES2020-module related, and the new version does nothing even remotely related to DOM manipulation different from the older working version.
When not using transitions, the shift of the container does not occur.
Has anyone come across something similar?
Does anyone know of other tools to deeper analyze the current layout state of a page more than the respective developer tools of the browsers?
Any other ideas?

Today I found a solution and at least some kind of explanation, but I still have to investigate some more to truly understand the why and how. I'll post an update if I find a better explanation.
The problem has to do with a text field and focus.
The page in question has a text (search) as its main component.
[I am aware and always was that browsers try to move focused elements into view, regardless of what the author's CSS says.
Therefore, when I decided to give focus to the text field which it does not have on its own, as every page movement required a button to be clicked, I did so on transitionend. This has never changed.
When the issue first occurred, one of the things I tried first was to disable that (auto) focus behavior. It did not solve the problem.
I cannot say what made that change in behavior happen. I change the construction of the page to include a grid some time before the issue occurred. That in itself was not the reason, however (it worked for quite some time with that system, and removing it did not sole the behavior).]
What solved the issue was to initially fully disable the text field and only enable it on transitionend (then focusing it).
The reason browsers moved the page to different positions likely has to do with this situation, as the text fields width is ch based.
The important takeaway (for now) for me is, that there is no hint to be found in the developer tools when the browsers moves - elements in the (in my case unsuccessful) attempt to keep inputs in the viewport.
I think that this should be changed/fixed.
I will as soon as I have the time try to better understand the things that made the problem occur, If someone has information or experience with similar situations pleas add useful hints and background info.

Used display:none for media queries and scroll is wrong fullPage.js

I used display:none for one of sections so its visible only on devices with less than 576px. And anchors are wrong, and scrolling jumps from second to first section. How to fix it?
This is the
page

According to GitHub's plugin docs, this is still an open issue that needs to be fixed by the lib's developer. What he mentioned as a workaround is destroying fullpage.js and reinitializing it again without the faulty section. (Whenever you are going to do that is up to you to find appropriate, whether on screen width resize, page loads, etc etc)

Bootstrap Affix plugin navbar top delay

I am using the latest release of bootstrap 3. I am using the affix plugin to make a static navbar fixed. It works however, there is a significantly long delay before the navbar updates and becomes fixed to the top. It is repeatable on all browsers.
I figured it would be easiest to show the problem with a video, I also provided some code.
see video
see JSFiddle
<h1></h1>
The effect I want is a clean instant transition like
this "http://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_affix&"
I should also point out that I am using jQuery to define my section heights and the affix offset, I initially thought this would be causing the delay however, now I think that is out of the question.
This feels like a performance issue to me. I think jQuery is taking a little bit too long to figure out the height and apply the styling to the navbar.
I am hoping someone might have some insight into this matter.

So I figured out what the issue was.
I wrote used jQuery to get the height of the header (the content above the navbar) in this case it was a video, and made it the affix offset. The way I fixed my jumping issue is just make the offset property a function that calculated the height of the header instead of a static variable.
Here is the updated JSFiddle
https://jsfiddle.net/DTcHh/23013/

How to keep one element fixed and the rest scrolled?

I am doing an website where I have to keep one image fixed to the screen and on scroll I want different elements to appear one by one and stick to one position. When this is done I continue to the footer of the website.
I have done tried to reach that but whatever I do the page keeps scrolling and does not wait for all the elements to appear on the screen.
Example of what I want to do can be seen here Link on the second page where the mobile phone it is sticked in the screen and on scroll different content appear one by one.
How do I achieve this ? What kind of libraries would you suggest?
Thank you in advance.

stuff like this is usually done with js libriaries, as you already wrote. One that is actively supported and works quite well is Scrollmagic. It should be able to do what you describe, at least it can do the stuff in the example you linked: It can "pin" elements on the page for a defined duration (= "scroll duration") or animate elements controlled by the scroll position.
Scrollmagic can be found on Github or here: http://scrollmagic.io/ , examples to be seen here: http://scrollmagic.io/examples/index.html

Your fixed html content should have css position: fixed;.

Have you tried position: sticky? There may be browser compatibility issues but there are polyfils out there to fix that.

WordPress causing animation to overflow

I am working on a website and added an animation of clouds flowing using adobe edge animation.
http://avuedesigns.com/iaq/
I have created a thread over at the adobe community (http://forums.adobe.com/thread/1128782) and it seems that my code to make it responsive, and the overflow are correctly setup.
So basically I have no idea why WordPress is either breaking it. Or why my little bit of code thinks the website is wider than it really is. Maybe fresh eyes can see something I am not.

correct your container has an overflow attribute most likely set to scroll within your css file.
set this to;
overflow: hidden;

Well, wordpress is just a cms engine that spits out html - it is hardly to blame. I do see that the width keeps changing and the horiz scroll bar appears and disappears which is definitely not optimal.
I think the starting place is with the main container div....do you have overflow:hidden set? This should allow your clouds to appear outside of the visible pane without forcing the div to change width.