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<!DOCTYPE html> <html> <head> <style> body { background-color: #E7E9EB; } #myDIV { width: 100%; height: 300px; background-color: #FFFFFF; border-block-start-style: solid; border-block-start-width: thick; } </style> </head> <body> <h1>The border-block-start-width Property</h1> <div id="myDIV"> A demonstration on different thicknesses of the border at the start in the block direction. </div> </body> </html>