The CSS content property is very useful for generated content in the ::before or ::after speudo-elements. To insert a new line / line break in that content, use the \A escape characters:
article h2::before {
content: "Killing \A Me \A Softly";
white-space: pre-wrap;
}
White-space property
In order for the new lines to work properly, you also need to set the white-space property to either pre or pre-wrap.
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