SVG icon usage in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an SVG icon?

An SVG icon is a small graphic made with Scalable Vector Graphics. It stays sharp at any size because it uses shapes, not pixels.

beginner

How do you include an SVG icon in Bootstrap?

You can include an SVG icon by using the <svg> element directly or by using Bootstrap Icons library with <svg class='bi'> and referencing the icon name.

beginner

Why use SVG icons instead of image files like PNG?

SVG icons scale without losing quality, have smaller file sizes, and can be styled with CSS easily.

intermediate

How can you change the color of an SVG icon in Bootstrap?

You can change the color by applying CSS styles to the SVG's fill property or by adding Bootstrap text color classes like text-primary.

intermediate

What accessibility feature should you add to SVG icons?

Add aria-hidden='true' if the icon is decorative, or use <title> inside SVG for screen readers if the icon conveys meaning.

What does SVG stand for?

A Simple Visual Guide

B Scalable Vector Graphics

C Standard Vector Grid

D Static Vector Graphic

SVG means Scalable Vector Graphics, which are graphics made from shapes that scale well.

Which HTML element is used to embed an SVG icon?

A <vector>

B <img>

C <icon>

D <svg>

The

How can you make an SVG icon accessible for screen readers?

A Add aria-hidden='true' if decorative

B Use only colors to convey meaning

C Avoid adding any ARIA attributes

D Use <img> tag instead

Adding aria-hidden='true' hides decorative icons from screen readers, improving accessibility.

What is a benefit of using SVG icons over PNG images?

A PNG images are smaller in file size

B SVG icons cannot be styled with CSS

C SVG icons scale without losing quality

D PNG images are vector-based

SVG icons keep sharp at any size because they are vector graphics.

In Bootstrap, how do you apply a color to an SVG icon?

A Use CSS fill property or Bootstrap text color classes

B Change the SVG file itself only

C Use the <color> HTML tag

D SVG icons cannot have colors changed

You can style SVG icons with CSS fill or Bootstrap text color classes like text-primary.

Explain how to add and style an SVG icon in a Bootstrap webpage.

Think about embedding, coloring, and accessibility.

Why are SVG icons preferred over traditional image icons in modern web design?

Consider how icons look and behave on different devices.

Practice

1. What is the main advantage of using SVG icons in Bootstrap over traditional image icons?

easy

A. They scale smoothly without losing quality on any screen size.

B. They load faster because they are always smaller files than images.

C. They automatically add animation effects without extra code.

D. They require no accessibility attributes to be readable.

Solution

1. Step 1: Understand SVG icon properties

   SVG icons are vector graphics, meaning they can scale to any size without losing sharpness or quality.

2. Step 2: Compare with traditional images

   Unlike raster images, SVGs do not pixelate when enlarged, making them ideal for responsive designs.

3. Final Answer:

   They scale smoothly without losing quality on any screen size. -> Option A

4. Quick Check:

   SVG icons scale well = A [OK]

Hint: SVG icons stay sharp at any size, unlike images [OK]

Common Mistakes:

• Thinking SVG files are always smaller than images
• Assuming SVGs add animations automatically
• Ignoring accessibility needs for icons

2. Which of the following is the correct way to set the color of a Bootstrap SVG icon to match surrounding text?

easy

A.

B.

C.

D.

Solution

1. Step 1: Identify how SVG color matches text

   Using fill="currentColor" makes the SVG icon inherit the current text color automatically.

2. Step 2: Check other options

   Options A and D set fixed colors, not dynamic. <svg color="text"></svg> uses an invalid attribute for SVG color.

3. Final Answer:

   <svg fill="currentColor"></svg> -> Option A

4. Quick Check:

   Use fill="currentColor" for text color match [OK]

Hint: Use fill="currentColor" to inherit text color [OK]

Common Mistakes:

• Using fixed color codes instead of currentColor
• Trying to use CSS color property inside SVG fill
• Confusing fill with stroke attribute

3. What will be the visible result of this Bootstrap SVG icon code snippet?

<svg class="bi bi-star" width="2rem" height="2rem" fill="currentColor"><use xlink:href="#star" /></svg>

medium

A. A star icon sized 2 rem by 2 rem, colored like the surrounding text.

B. An empty box because the #star symbol is not defined in the snippet.

C. A star icon but always black regardless of text color.

D. A broken image icon because SVG cannot use <use> elements.

Solution

1. Step 1: Understand the use of <use> with xlink:href

   The <use> element references an SVG symbol with id "star" defined elsewhere in the document or sprite.

2. Step 2: Check if #star is defined

   Since the snippet does not define the symbol with id "star", the icon will not render and show empty space or nothing.

3. Final Answer:

   An empty box because the #star symbol is not defined in the snippet. -> Option B

4. Quick Check:

   Undefined symbol reference = empty icon [OK]

Hint: SVG <use> needs defined symbol to show icon [OK]

Common Mistakes:

• Assuming <use> works without symbol definition
• Thinking fill="currentColor" forces black color
• Believing SVG <use> is unsupported

4. Identify the error in this Bootstrap SVG icon usage:

<svg role="img" aria-label="Search icon"><path d="M10 10 L20 20" /></svg>

medium

A. Missing <title> element for accessibility despite role and aria-label.

B. Missing fill attribute to set icon color.

C. Missing width and height attributes for sizing.

D. Incorrect use of <path> element inside SVG.

Solution

1. Step 1: Check SVG accessibility attributes

   The SVG has role="img" and aria-label="Search icon", which is good for screen readers.

2. Step 2: Check for sizing attributes

   SVG icons should have width and height attributes to define visible size; missing here means it may not display properly.

3. Final Answer:

   Missing width and height attributes for sizing. -> Option C

4. Quick Check:

   SVG needs width and height to show correctly [OK]

Hint: Always add width and height to SVG icons [OK]

Common Mistakes:

• Thinking fill attribute is mandatory for visibility
• Assuming aria-label replaces need for sizing
• Believing <path> usage is incorrect here

5. You want to use a Bootstrap SVG icon that changes color based on a button's state (normal and hover). Which approach correctly applies this behavior?

hard

A. Wrap SVG in a <span> and toggle different SVG files on hover.

B. Set a fixed fill color on SVG and change it with JavaScript on hover.

C. Use inline styles on SVG to change fill color on hover directly.

D. Set fill="currentColor" on the SVG and change the button's text color with CSS on hover.

Solution

1. Step 1: Use fill="currentColor" for color inheritance

   Setting fill="currentColor" makes the SVG icon inherit the text color of its container.

2. Step 2: Change button text color on hover with CSS

   By changing the button's text color on hover, the SVG icon color changes automatically without extra code.

3. Final Answer:

   Set fill="currentColor" on the SVG and change the button's text color with CSS on hover. -> Option D

4. Quick Check:

   fill="currentColor" + CSS hover color = dynamic icon color [OK]

Hint: Use fill="currentColor" and CSS text color hover [OK]

Common Mistakes:

• Using fixed fill colors that don't change on hover
• Trying to change SVG fill with inline styles on hover
• Replacing SVG files instead of using CSS color changes