Bordered and borderless tables in Bootsrap - Browser Rendering Trace

Render Flow - Bordered and borderless tables

Load HTML table element

↓

Apply Bootstrap classes

↓

Add borders if .table-bordered present

↓

Remove borders if .table-borderless present

↓

Render table with styles

↓

Paint on screen

The browser reads the table HTML, applies Bootstrap's CSS classes for borders or no borders, then paints the table with or without visible borders.

Render Steps - 3 Steps

Code Added:<table> element with no border classes

Before

[Table]
| Header 1 | Header 2 |
| Cell 1   | Cell 2   |

→

After

[Table]
| Header 1 | Header 2 |
| Cell 1   | Cell 2   |

Without any border classes, the table shows no visible borders around cells or table edges.

🔧 Browser Action:Creates DOM tree and paints default table without borders

Code Sample

A table with visible borders around cells and the table itself.

Bootsrap

<table class="table table-bordered">
  <thead>
    <tr><th>Header 1</th><th>Header 2</th></tr>
  </thead>
  <tbody>
    <tr><td>Cell 1</td><td>Cell 2</td></tr>
  </tbody>
</table>

Bootsrap

.table-bordered {
  border: 1px solid #dee2e6;
}
.table-bordered th,
.table-bordered td {
  border: 1px solid #dee2e6;
}
.table-borderless th,
.table-borderless td {
  border: 0;
}

Render Quiz - 3 Questions

After applying step 2 (.table-bordered), what visual change do you see?

A Borders appear around the table and each cell

B Borders disappear from the table

C Table background color changes

D Text inside cells becomes bold

Common Confusions - 2 Topics

Why do I still see borders when I use .table-borderless?

Sometimes other CSS or browser default styles add borders. Make sure .table-borderless is applied correctly and no other conflicting styles override it. Also, check that you removed .table-bordered.

💡 Only one border class (.table-bordered or .table-borderless) should be used at a time to avoid conflicts.

Why does the table look the same before and after adding .table-bordered?

If the Bootstrap CSS is not loaded or the class name is misspelled, the border styles won't apply. Check your CSS link and class spelling.

💡 Borders appear only if Bootstrap CSS is properly loaded and classes are spelled exactly.

Property Reference

Class	Effect on Table	Effect on Cells	Visual Result	Common Use
.table	Default Bootstrap table styles	Default cell padding and alignment	No borders visible	Basic styled table
.table-bordered	Adds 1px solid border around table	Adds 1px solid border around each cell	Grid lines visible around cells and table	When you want clear cell separation
.table-borderless	Removes all borders from table	Removes all borders from cells	No visible borders, clean look	When you want a minimal or clean table

Concept Snapshot

Bootstrap tables can have borders or be borderless. Use .table-bordered to add borders around table and cells. Use .table-borderless to remove all borders. Only one border class should be used at a time. Borders help visually separate cells. No borders give a clean, minimal look.