Grid column generator with loops in SASS - Browser Rendering Trace

Render Flow - Grid column generator with loops

Read SASS file

↓

Parse variables and loops

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Generate CSS grid-template-columns rules

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Compile to CSS

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Browser applies CSS to grid container

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Grid layout calculates columns

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Render grid items in columns

The SASS code with @for loops generates multiple CSS classes (.grid-1 to .grid-12) for different column counts. The browser reads the compiled CSS, applies the grid layout to e.g. .grid-4, and visually arranges items into the specified columns.

Render Steps - 3 Steps

Code Added:display: grid;

Before

[grid-4]
  [Item 1]
  [Item 2]
  [Item 3]
  [Item 4]
  [Item 5]

→

After

[grid-4]
  [Item 1]
  [Item 2]
  [Item 3]
  [Item 4]
  [Item 5]

The container becomes a grid, but no columns are defined yet, so items stack vertically.

🔧 Browser Action:Creates grid formatting context; triggers reflow

Code Sample

SASS @for loop generates .grid-1 to .grid-12 classes with varying column counts. Example HTML uses .grid-4 for 4 equal columns and gaps, placing 5 items across these columns.

SASS

<div class="grid-4">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
  <div>Item 4</div>
  <div>Item 5</div>
</div>

SASS

$max-columns: 12;
@for $i from 1 through $max-columns {
  .grid-#{$i} {
    display: grid;
    grid-template-columns: repeat(#{$i}, 1fr);
    gap: 1rem;
  }
}

Render Quiz - 3 Questions

After applying step 2, how are the grid items arranged?

A Four items in a row and the fifth item on a new row

B All items stacked vertically in one column

C Items arranged randomly without columns

D Items overlapping each other

Common Confusions - 2 Topics

Why do my grid items stack vertically even after setting display: grid?

Without defining grid-template-columns, the grid has one column by default, so items stack vertically. See render_step 1 and 2.

💡 Always set grid-template-columns to create columns.

Why is there no space between my grid items?

The gap property adds space between grid cells. Without it, items touch each other. See render_step 3.

💡 Use gap to add consistent spacing in grids.

Property Reference

Property	Value Applied	Axis/Direction	Visual Effect	Common Use
display	grid	N/A	Creates grid container for children	Layout container
grid-template-columns	repeat(4, 1fr)	Horizontal	Creates 4 equal columns	Define grid columns
gap	1rem	Both	Adds space between grid items	Spacing between items

Concept Snapshot

Grid layout uses display: grid to create a grid container. SASS @for loops generate .grid-n classes with grid-template-columns: repeat(n, 1fr). gap adds spacing between grid items. Without grid-template-columns, items stack vertically. Use @for loops in SASS to generate flexible grid column setups for 1-12 columns.