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The source of the problem is described by William Stein in CoCalc GitHub as the presence of the 3 lines

  a[href]:after {
    content: " (" attr(href) ")";
  }

in a .ccs file used by nbgrader. I believe he will provide an optimized for CoCalc and described a workaround, but this may not propagate to local installations.

On my local Win 10 Sagemath 9.3 installation, I found the offending 3 lines in 2 copies of style.min.css (around lines 202/4). Removing these lines solved the problem with my local installation. The same lines can be removed from an existing .html file to allow proper printing as pdf in any browser.

The source of the problem is described by William Stein in CoCalc GitHub as the presence of the 3 lines

  a[href]:after {
    content: " (" attr(href) ")";
  }

in a .ccs file used by nbgrader. I believe he will provide an optimized solution for CoCalc and described a workaround, but this may not propagate to local installations.

On my local Win 10 Sagemath 9.3 installation, I found the offending 3 lines in 2 copies of style.min.css (around lines 202/4). Removing these lines solved the problem with my local installation. The same lines can be removed from an existing .html file to allow proper printing as pdf in any browser.