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.

Practice

1. What does the Bootstrap class table-bordered do to a table?

easy

A. Changes the table background color

B. Removes all borders from the table

C. Adds borders around all table cells

D. Makes the table text bold

Solution

1. Step 1: Understand the purpose of table-bordered

   This class adds visible borders around each cell in the table to separate data clearly.

2. Step 2: Compare with other classes

   Unlike table-borderless which removes borders, table-bordered adds them for clarity.

3. Final Answer:

   Adds borders around all table cells -> Option C

4. Quick Check:

   table-bordered means borders added [OK]

Hint: Borders mean table-bordered, no borders mean table-borderless [OK]

Common Mistakes:

• Confusing table-bordered with background color changes
• Thinking it removes borders instead of adding
• Assuming it changes text style

2. Which is the correct way to make a Bootstrap table borderless?

easy

A. <table class='table table-borderless'>

B. <table class='borderless-table'>

C. <table class='table borderless'>

D. <table class='table table-bordered'>

Solution

1. Step 1: Recall Bootstrap borderless table class

   The correct class to remove borders is table-borderless used alongside table.

2. Step 2: Check syntax correctness

   <table class='table table-borderless'> uses class='table table-borderless', which is the proper Bootstrap syntax.

3. Final Answer:

   <table class='table table-borderless'> -> Option A

4. Quick Check:

   Borderless table uses table-borderless [OK]

Hint: Use table-borderless with table class for no borders [OK]

Common Mistakes:

• Using only borderless without table
• Confusing table-bordered with borderless
• Misspelling the class name

3. What will be the visual difference between these two tables?

<table class='table table-bordered'>...</table>
and
<table class='table table-borderless'>...</table>

medium

A. The first table has borders; the second has no borders

B. Both tables will have thick borders around cells

C. Both tables will have no borders

D. The second table will have colored borders

Solution

1. Step 1: Understand table-bordered effect

   This class adds visible borders around all table cells.

2. Step 2: Understand table-borderless effect

   This class removes all borders, making the table look clean without lines.

3. Final Answer:

   The first table has borders; the second has no borders -> Option A

4. Quick Check:

   Bordered vs borderless means borders vs no borders [OK]

Hint: Bordered means lines; borderless means no lines [OK]

Common Mistakes:

• Assuming borderless still shows borders
• Thinking both tables look the same
• Confusing border color with border presence

4. You wrote this code but the table still shows borders:

<table class='table borderless'>
  <tr><td>Data</td></tr>
</table>

What is the error?

medium

A. Table tag is missing closing tag

B. Missing table-borderless class; used borderless instead

C. You need to add table-bordered to remove borders

D. The tr tag is incorrect

Solution

1. Step 1: Check class names for borderless table

   The correct class to remove borders is table-borderless, not just borderless.

2. Step 2: Verify HTML structure

   The table tag is properly closed and tr is correct, so no errors there.

3. Final Answer:

   Missing table-borderless class; used borderless instead -> Option B

4. Quick Check:

   Use exact Bootstrap class table-borderless [OK]

Hint: Use full class table-borderless, not partial names [OK]

Common Mistakes:

• Using incomplete or wrong class names
• Confusing table-bordered with borderless
• Ignoring proper closing tags

5. You want a table with borders only around the entire table but no borders between cells. Which Bootstrap classes should you use?

hard

A. table table-bordered

B. table table-borderless

C. border border-1

D. table border

Solution

1. Step 1: Understand Bootstrap border classes

   table-bordered adds borders around all cells, not just the table.

2. Step 2: Use border on table only

   Bootstrap's border class adds border around the element itself. Combined with table, it provides table styling with border only around the table and no cell borders.

3. Step 3: Why other options fail

   Options B and D add or remove all cell borders. border border-1 adds border but lacks table styling. table border is correct.

4. Final Answer:

   table border -> Option D

5. Quick Check:

   Border on table only needs table border [OK]

Hint: Use table border for outer table border only [OK]

Common Mistakes:

• Assuming table-bordered only borders table edges
• Omitting the table class and using only border utilities
• Confusing cell borders with table border