::before

css/style.css

p::before {
content: "This is a ";
color: #852E76;
font-size: 1.2em;
}

p::before {
 content: "This is a ";
 color: #852E76;
 font-size: 1.2em;
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
</head>
<body>
<p>London</p>
<p>Kiev</p>
<p>Moscow</p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
</head>
<body>
<p>London</p>
<p>Kiev</p>
<p>Moscow</p>
</body>
</html>