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Lab1
bai 1
bai 2
bai 3
Lab2
Lab3
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bai 4
bai 5
bai 6
bai 7
bai 8
bai 9
bai 10
Lab4
Bài 3: Change the color of all elements with the class "colortext", to "red".
<!DOCTYPE html> <html> <head> <style> </style> </head> <body> <h1>This is a Heading</h1> <p class="colortext">This is a paragraph.</p> <p class="colortext">This is another paragraph.</p> </body> </html>
