Small and compact tables in Bootsrap - Performance & Optimization

Performance: Small and compact tables

MEDIUM IMPACT

This affects page load speed and rendering performance by reducing DOM size and paint area for tables.

Displaying tabular data with minimal space and fast rendering

Bootsrap

<table class="table table-sm">
  <thead>
    <tr><th>Header 1</th><th>Header 2</th></tr>
  </thead>
  <tbody>
    <tr><td>Data 1</td><td>Data 2</td></tr>
    <tr><td>Data 3</td><td>Data 4</td></tr>
  </tbody>
</table>

Using the .table-sm class reduces padding and spacing, making the table smaller and faster to render.

📈 Performance GainReduces paint area and layout size, improving LCP by rendering fewer pixels.

Displaying tabular data with minimal space and fast rendering

Bootsrap

<table class="table">
  <thead>
    <tr><th>Header 1</th><th>Header 2</th></tr>
  </thead>
  <tbody>
    <tr><td>Data 1</td><td>Data 2</td></tr>
    <tr><td>Data 3</td><td>Data 4</td></tr>
  </tbody>
</table>

Default Bootstrap tables have larger padding and spacing, increasing table size and paint area.

📉 Performance CostTriggers larger paint area and more pixels to render, increasing LCP time.

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
Default Bootstrap table	Minimal	1 per table render	High due to large padding	[X] Bad
Bootstrap table with .table-sm	Minimal	1 per table render	Lower due to reduced padding	[OK] Good

Rendering Pipeline

The browser calculates styles, then layouts the table cells. Smaller padding reduces layout size and paint area, speeding up paint and composite stages.

→Style Calculation

→Layout

→Paint

→Composite

⚠️ BottleneckPaint stage is most expensive due to large pixel area of default tables.

Core Web Vital Affected

LCP

This affects page load speed and rendering performance by reducing DOM size and paint area for tables.

Optimization Tips

1Use .table-sm to reduce padding and spacing in Bootstrap tables.

2Smaller tables reduce paint area, speeding up rendering.

3Compact tables improve Largest Contentful Paint (LCP) by loading main content faster.

Performance Quiz - 3 Questions

What is the main performance benefit of using Bootstrap's .table-sm class?

A Increases font size for readability

B Adds animations to table rows

C Reduces table padding and spacing, decreasing paint area

D Loads table data asynchronously

DevTools: Performance

How to check: Record a performance profile while loading the page with the table. Look at the 'Paint' and 'Layout' events in the flame chart.

What to look for: Smaller paint rectangles and shorter layout times indicate better performance with compact tables.

Practice

1. What does the Bootstrap class table-sm do when added to a table?

easy

A. Makes the table smaller and more compact by reducing padding

B. Changes the table background color to gray

C. Adds borders around each table cell

D. Makes the table text bold and larger

Solution

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

   The table-sm class in Bootstrap reduces the padding inside table cells, making the table smaller and more compact.

2. Step 2: Compare with other options

   Other options describe unrelated styles like background color, borders, or text size, which table-sm does not control.

3. Final Answer:

   Makes the table smaller and more compact by reducing padding -> Option A

4. Quick Check:

   table-sm = smaller, compact table [OK]

Hint: Remember: 'sm' means small and compact table padding [OK]

Common Mistakes:

• Confusing table-sm with color or border classes
• Thinking it changes font size or weight
• Assuming it adds table stripes or hover effects

2. Which is the correct way to apply a small and compact style to a Bootstrap table?

easy

A. <table class='table compact'>

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

C. <table class='table small-table'>

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

Solution

1. Step 1: Identify Bootstrap's official class for small tables

   Bootstrap uses table-sm to make tables small and compact, not table-small, small-table, or compact.

2. Step 2: Verify syntax correctness

   The correct syntax includes both table and table-sm classes inside the class attribute.

3. Final Answer:

   <table class='table table-sm'> -> Option D

4. Quick Check:

   Use table-sm with table class [OK]

Hint: Always pair table-sm with table class [OK]

Common Mistakes:

• Using incorrect class names like 'table-small' or 'compact'
• Forgetting to include the base 'table' class
• Misspelling the class name as 'table sm'

3. What will be the visual difference when rendering this table with Bootstrap classes?

<table class='table table-sm'>
  <tr><td>Item</td><td>Price</td></tr>
  <tr><td>Apple</td><td>$1</td></tr>
</table>

medium

A. The table cells have less padding, making the table more compact

B. The table text will be italicized

C. The table will have a blue background

D. The table rows will have alternating colors

Solution

1. Step 1: Understand the effect of table-sm on table cells

   The table-sm class reduces the padding inside each cell, making the table appear smaller and more compact.

2. Step 2: Check other options for unrelated styles

   Italic text, background color, or striped rows are not caused by table-sm but by other classes like table-striped or custom CSS.

3. Final Answer:

   The table cells have less padding, making the table more compact -> Option A

4. Quick Check:

   table-sm = less padding, compact table [OK]

Hint: Less padding means smaller, tighter table cells [OK]

Common Mistakes:

• Assuming table-sm changes text style or colors
• Confusing with striped or hover effects
• Expecting background color changes

4. You wrote this code but the table is not compact:

<table class='table small'>
  <tr><td>Name</td><td>Age</td></tr>
  <tr><td>John</td><td>30</td></tr>
</table>

What is the error?

medium

A. The table tag is missing a closing tag

B. The class should be table-sm, not small

C. The table rows need tbody wrapper

D. The table cells should use th instead of td

Solution

1. Step 1: Check the class name for compact tables

   The class small is not a valid Bootstrap class for tables. The correct class to make tables compact is table-sm.

2. Step 2: Verify other code parts

   The table tag is properly closed, tbody is optional, and td is valid for data cells. These are not errors causing lack of compactness.

3. Final Answer:

   The class should be table-sm, not small -> Option B

4. Quick Check:

   Use table-sm for compact tables [OK]

Hint: Use exact class table-sm, not 'small' [OK]

Common Mistakes:

• Using 'small' instead of 'table-sm'
• Thinking missing tbody breaks compact style
• Confusing td and th roles

5. You want a table that is small and compact but also has striped rows and hover effect. Which is the correct class combination?

hard

A. table table-small striped hover

B. table-sm table-striped table-hover

C. table table-sm table-striped table-hover

D. table compact striped hover

Solution

1. Step 1: Identify required Bootstrap classes

   Bootstrap requires the base table class plus modifiers like table-sm for small tables, table-striped for striped rows, and table-hover for hover effect.

2. Step 2: Check each option for correctness

   Only table table-sm table-striped table-hover includes all correct classes with proper prefixes. The other options miss the base table class or use invalid class names.

3. Final Answer:

   table table-sm table-striped table-hover -> Option C

4. Quick Check:

   Combine table with all needed modifiers [OK]

Hint: Always include base table class with modifiers [OK]

Common Mistakes:

• Omitting the base table class
• Using invalid class names like 'table-small' or 'compact'
• Forgetting to add hover or striped classes properly