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CSS - border-block-start-width Property
The logical block-start border width of an element is specified by the border-block-start-width CSS property, which is translated into a physical border width depending on the writing mode, directionality, and text orientation of the element.
Based on the writing-mode, direction, and text-orientation values entered, it can be used with border-top-width, border-right-width, border-bottom-width, or border-left-width.
Possible value
<'border-width'> - The width of the border.
Syntax
border-block-start-width = <line-width> <line-width> = <length [0,∞]> | thin | medium | thick
Applies to
All the HTML elements.
CSS border-block-start-width - length Value
The following example demonstrates the usage of border-block-start-width property.
<html> <head> <style> body { font-family: 'Arial', sans-serif; margin: 50px; padding: 50px; background-color: #f0f0f0; } .new-container { background-color: #ffd700; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; border-radius: 15px; box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.8); } .custom-border { border: 4px dashed #e74c3c; border-block-start-style: ridge; border-block-start-width: 10px; padding: 15px; margin: 10px; font-size: 22px; font-weight: bold; color: #333; } </style> </head> <body> <div class="new-container"> <p class="custom-border">A border-block-start-width example</p> </div> </body> </html>
CSS border-block-start-width - thin value
The following example demonstrates the usage of border-block-start-width property with thin width value.
<html> <head> <style> body { font-family: 'Arial', sans-serif; margin: 50px; padding: 50px; background-color: #f0f0f0; } .new-container { background-color: #a6d1ed; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; border-radius: 15px; box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.8); } .custom-border { border: 4px dashed #e74c3c; border-block-start-style: solid; border-block-start-width: thin; padding: 15px; margin: 10px; font-size: 22px; font-weight: bold; color: #333; } </style> </head> <body> <div class="new-container"> <p class="custom-border">A example with border-block-start-width property with thin style</p> </div> </body> </html>
CSS border-block-start-width - medium value
The following example demonstrates the usage of border-block-start-width property with medium width value.
<html> <head> <style> body { font-family: 'Arial', sans-serif; margin: 50px; padding: 50px; background-color: #f0f0f0; } .new-container { background-color: #a6d1ed; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; border-radius: 15px; box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.8); } .custom-border { border: 4px dashed #034673; border-block-start-style: solid; border-block-start-width: medium; padding: 15px; margin: 10px; font-size: 22px; font-weight: bold; color: #333; } </style> </head> <body> <div class="new-container"> <p class="custom-border">A example with border-block-start-width property with medium style</p> </div> </body> </html>
CSS border-block-start-width - thick value
The following example demonstrates the usage of border-block-start-width property with thick width value.
<html> <head> <style> body { font-family: 'Arial', sans-serif; margin: 50px; padding: 50px; background-color: #f0f0f0; } .new-container { background-color: #d8f0d3; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; border-radius: 15px; box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.8); } .custom-border { border: 4px dashed #1d8a07; border-block-start-style: solid; border-block-start-width: thick; padding: 15px; margin: 10px; font-size: 22px; font-weight: bold; color: #333; } </style> </head> <body> <div class="new-container"> <p class="custom-border">A example with border-block-start-width property with thick style.</p> </div> </body> </html>
CSS border-block-start-width - Writing mode
The following example demonstrates the usage of border-block-start-width property with vertical writing mode.
<html> <head> <style> body { font-family: 'Arial', sans-serif; margin: 50px; padding: 50px; background-color: #f0f0f0; } .vertical-container { background-color: #87cefa; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; border-radius: 15px; box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.8); } .vertical-border { writing-mode: vertical-rl; border: 3px solid #475861; border-block-start-style: dotted; border-block-start-width: 6px; padding: 12px; margin: 10px; font-size: 20px; font-weight: bold; color: #333; } </style> </head> <body> <div class="vertical-container"> <p class="vertical-border">A border-block-start-width example with vertical writing mode.</p> </div> </body> </html>
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