curtisblackwell curtisblackwell - 6 months ago 11
CSS Question

Why do Safari and Firefox seem to incorrectly render my gradient and how can I fix it?

Here's the code on CodePen. It looks exactly as I expect in Chrome. Firefox and Safari both look wrong. (I'm on the latest versions of all 3.)

I'm working on a way to use a constant gradient background across multiple

inline-block
elements. Here's how it's working right now:


  1. I have a parent
    ol
    whose
    :before
    pseudo-element has a gradient background (
    transparent
    to opaque color) and a
    z-index
    set to display it above the child
    li
    s.

  2. The
    li
    s have the
    background-color
    set to the color that looks like what the gradient's
    transparent
    value is set to.

  3. The
    li
    's
    color
    is set to
    transparent
    and have
    :before
    pseudo-elements that display the text that's previously set to
    transparent
    and have their z-indices set to display above the
    ol:before
    (with background gradient).



The problems I'm seeing in Firefox:




  1. The gradient looks like it's got 3 color stops (transparent, grey, transparent) instead of the 2 that are set.

  2. The gradient seems as though it's got a multiply blend mode set.



The problems I'm seeing in Safari:



In addition to the same problems in Firefox, it also displays two gradients which seem to have multiply blend modes. One from
-webkit-linear-gradient
and one from
linear-gradient
. Solving the issue of the apparent blend mode should take care of this third issue, though.




My googling made me aware of
background-blend-mode
, but setting that to
normal
(or any other valid value) changed nothing. I think it only works with multiple backgrounds on a single element, but I'm not sure about that. However, that would explain why it doesn't solve my problems.

Answer

The problem was that I used the keyword transparent rather than a transparent version of the color that it was gradating to. The browsers that didn't render the gradient as expected were treating transparent as transparent black. That meant that different gradations between black and my color were present in the gradient.

I'm using SASS so the fix is pretty simple: Just use the rgba() function to convert my hex color to rgba.

background-image: linear-gradient(to top right, rgba($brand-primary, 0), $brand-primary);

I updated the code on CodePen to show the solution.

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