Issue with rendering Html Element on FireFox compared to Chrome

Having some trouble with an individual component (a simple dropzone) while testing on Firefox. It seems to work fine on Chrome, and the CSS looks good.

Css

.container {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 50%;
}

.inputDnD {
  .form-control-file {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 6em;
    outline: none;
    visibility: hidden;
    cursor: pointer;
    background-color: #c61c23;
    box-shadow: 0 0 5px solid currentColor;
    &:before {
      content: attr(data-title);
      position: absolute;
      left: 0;
      width: 100%;
      min-height: 6em;
      line-height: 2em;
      padding-top: 1.5em;
      opacity: 1;
      visibility: visible;
      text-align: center;
      border: 0.25em dashed currentColor;
      transition: all 0.3s cubic-bezier(.25, .8, .25, 1);
      overflow: visible;
    }
    &:hover {
      &:before {
        border-style: solid;
        box-shadow: inset 0px 0px 0px 0.25em currentColor;
      }
    }
  }
}

// PRESENTATIONAL CSS
body {
  background-color: #1F1F1F;
}

Issue: The problem arises when viewing on Firefox, where it's not displaying as expected. I've double-checked my CSS implementation but can't figure out why it's behaving this way.

If anyone has insights on why Firefox might be struggling to display due to the positioning, I would appreciate your assistance. Thank you for your time.

Answer №1

It appears that the issue stems from invalid CSS:

 // PRESENTATIONAL CSS

Unfortunately, the Firefox CSS parser seems to struggle with recovering from errors without consuming the subsequent line that defines a background color for the body element. In my experience, Firefox tends to resume parsing after encountering the next ; or possibly } to circumvent encountered errors.

The remedy, in this case, is to utilize CSS comments:

/* PRESENTATIONAL CSS */

update:

Upon checking the console (in Firefox), it has come to light that there are additional errors:

.inputDnD {
   .form-control-file {

This snippet indicates that .form-control-file { does not adhere to valid CSS property naming conventions. Even Microsoft Edge, another webkit browser, identifies multiple issues with the CSS's validity. It would be advisable to rectify these CSS errors before proceeding further.

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