Omitting a single line:
white-space : nowrap;
overflow : hidden;
text-overflow: ellipsis;
Multiple lines are omitted:
overflow: hidden;
max-height: 44px;
text-overflow: ellipsis;
-webkit-box-orient: vertical;
word-break:break-word;
/* autoprefixer: off */
display:-webkit-box;
-webkit-box-orient:vertical;
-webkit-line-clamp:2;
/* autoprefixer: on */
(Commented out part is to ensure that when compiling old code is not lost)