7mo ago

Problem when using 'position: sticky' in 'about:addons' page

Hi, I want to solve this behavior when scrolling in 'about:addons' page. I put a background-image in body using 'userChrome.css' and in 'userContent.css' I set transparency in some elements backgrounds, but when I scroll the #main element goes behind .sticky-container element, so here is my question: Can I make the #main and .sticky-container elements don't cross, I tried to set a margin, clip-path, etc but I couldn't make any progress to solve it.

6 comments

~~Maybe try to set "overflow: hidden" on the container of the scrolling elements?~~
Edit: I'm not so sure about that now. I think I'm confusing it for something else.
- the element with position: sticky makes it like float, always visible, and seems like the element don't reserve space and other elements can go behind it, I don't know how to solve it without remove that behavior (always visible on top).
I'm not sure if you can do that, but you may be able to make the sticky-container opaque, so that it covers the scrolled contents, but assign it the same background-image that you are using on body and then try setting background-attachment: fixed for it and maybe play with few background-position values to align it to the background-image of the body. And also make sure the image is shown as same size.
- hi, I had in that way in the past, but I wanted to remove the need to align the image (when menubar is on, when not, when bookmarks-bar is on, when not, where using tre-tabs and its necessary to align again). I will end removing the position: sticky from .sticky-container
  
  Oh I think I misunderstood what you are doing, I thought you meant you set the content document body to also have the background-image, in which case the same alignment issue would still happen. But it sounds like you have just one image at the main-window body and the content area is transparent.
  With some shuffling you could achieve pretty much the same result visually - so that the header sticks, but doesn't overlay the list:
  css
  
  @-moz-document url("about:addons"){ #content{ max-height: 100vh; display: grid; grid-template-rows: auto auto 1fr; --in-content-page-background: transparent; } #page-header > .sticky-container{ position: static !important; } #main{ overflow: auto; padding-inline: 6px; scrollbar-gutter: stable; } }

6 comments