Sublime Text
<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> </head> <body> <p>Học <span style="background-color:red">CSS</span> miễn phí</p> </body> </html>
<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> </head> <body> <p>Học <span style="background-color:red">CSS</span> miễn phí</p> </body> </html>