This is a block element.
Change div background color using css property in js <html> <head> <style> .new-class{ background-color:red; } </style> </head> <body> <div>This is a block element.</div> <script> document.querySelector('div').setAttribute('class', 'new-class'); </script> </body> </html> You may like these posts : Write Your Comment
Change div background color using css property in js <html> <head> <style> .new-class{ background-color:red; } </style> </head> <body> <div>This is a block element.</div> <script> document.querySelector('div').setAttribute('class', 'new-class'); </script> </body> </html>
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