Using a background image in CSS for horizontal rules can override other styling rules

Encountered an unusual CSS bug:

After using background-image to style hr, none of the subsequent rules or selectors are displaying on the page:

hr {
  border: 0;
  height: 1px;
  background-image: -webkit-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
  background-image: -moz-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
  background-image: -ms-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0);
  background-image: -o-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
}

In Firefox, only 1 active rule is shown in the dev tools, despite many rules being present afterwards. Moving this particular rule to the end resolved the issue.

Any explanation for this behavior that I may be overlooking? It seems like there might be a simple solution that I'm missing.

cssfirefox

Answer №1

Take a look at this snippet:

background-image: -ms-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0);

You'll notice that there is a missing closing parenthesis ) at the end.

Answer №2

Give this a shot:

hr {
  border: 0;
  height: 1px;
  background-image: -webkit-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
  background-image: -moz-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
  background-image: -ms-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0)));
  background-image: -o-linear-gradient(left, rgba(0,0,0,0), rgba(0,0,0,0.75), rgba(0,0,0,0));
}

Ensure to close the parenthesis in the -ms-linear-gradient line.

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