Generated by SassMeister.com.

SassMeister-input-HTML.html

<div>
  <p data-text="gfdgkhdsfgkljenbdek;jbnerbjeargjhaerjnadbknjdfbknjdfkjenrghkjnbkdjfngkjgeljrbnekrjbnalerghidzg;kjlhsdgfmn,.dbf.com">gfdgkhdsfgkljenbdek;jbnerbjeargjhaerjnadbknjdfbknjdfkjenrghkjnbkdjfngkjgeljrbnekrjbnalerghidzg;kjlhsdgfmn,.dbf.com</p>
</div>

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

div {
  width: 100%;
  border: 1px solid black;
  position: absolute;
}

p {
  width: 50%;
  overflow: hidden;
  text-overflow: ellipsis;
}

p:after{
  content: attr(data-text);
  display: block;
  direction: rtl;
  margin-left: 50%;
  position: absolute;
  right: 1.8em;
  top: 1em;
  width: 50%;
  overflow: hidden;
    text-overflow: ellipsis;
}

SassMeister-output.css

div {
  width: 100%;
  border: 1px solid black;
  position: absolute;
}

p {
  width: 50%;
  overflow: hidden;
  text-overflow: ellipsis;
}

p:after {
  content: attr(data-text);
  display: block;
  direction: rtl;
  margin-left: 50%;
  position: absolute;
  right: 1.8em;
  top: 1em;
  width: 50%;
  overflow: hidden;
  text-overflow: ellipsis;
}

SassMeister-rendered.html

<div>
  <p data-text="gfdgkhdsfgkljenbdek;jbnerbjeargjhaerjnadbknjdfbknjdfkjenrghkjnbkdjfngkjgeljrbnekrjbnalerghidzg;kjlhsdgfmn,.dbf.com">gfdgkhdsfgkljenbdek;jbnerbjeargjhaerjnadbknjdfbknjdfkjenrghkjnbkdjfngkjgeljrbnekrjbnalerghidzg;kjlhsdgfmn,.dbf.com</p>
</div>