Image sizing basics in HTML - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add an image with a width of 200 pixels.

HTML

<img src="flower.jpg" alt="A red flower" width="[1]">

Drag options to blanks, or click blank then click option'

A200

B100%

Cauto

D50vw

Attempts:

3 left

💡 Hint

Common Mistakes

Using percentages or units like 'vw' inside the width attribute (which expects pixels).

Leaving the width attribute empty.

The width attribute sets the image width in pixels. Here, 200 means 200 pixels wide.

2fill in blank

medium

Complete the CSS code to set the image height to 150 pixels.

HTML

img {
  height: [1];
}

Drag options to blanks, or click blank then click option'

Aauto

B150

C15em

D150px

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting units like 'px' in CSS size values.

Using 'auto' which lets the browser decide the height.

In CSS, you must specify units like px for pixel sizes. So 150px sets height to 150 pixels.

3fill in blank

hard

Fix the error in the HTML to make the image width 300 pixels.

HTML

<img src="tree.jpg" alt="A tall tree" width="[1]">

Drag options to blanks, or click blank then click option'

Aauto

B300px

C300

D100%

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 'px' units inside the width attribute in HTML.

Using percentage values in the width attribute.

The width attribute in HTML expects a number only, without units. So use 300, not 300px.

4fill in blank

hard

Fill both blanks to set the image width to 100 pixels and height to auto in CSS.

HTML

img {
  width: [1];
  height: [2];
}

Drag options to blanks, or click blank then click option'

A100px

Bauto

C150px

D50%

Attempts:

3 left

💡 Hint

Common Mistakes

Setting both width and height to fixed pixel values causing stretched images.

Using percentages for height which may distort the image.

Setting width to 100px fixes the width. Setting height to auto keeps the image's natural height ratio.

5fill in blank

hard

Fill all three blanks to create a responsive image that fills its container width but keeps its aspect ratio.

HTML

<img src="mountain.jpg" alt="A mountain" style="width: [1]; height: [2]; max-width: [3];">

Drag options to blanks, or click blank then click option'

A100%

Bauto

D300px

Attempts:

3 left

💡 Hint

Common Mistakes

Setting fixed pixel widths that break responsiveness.

Setting height to a fixed pixel value causing distortion.

Setting width to 100% makes the image fill its container's width. Height auto keeps the aspect ratio. Max-width 100% prevents the image from growing larger than its container.

Practice

1. Which HTML attribute is used to set the width of an image directly in the tag?

easy

A. width

B. size

C. length

D. scale

Solution

1. Step 1: Identify image sizing attributes

   The width attribute is used in the <img> tag to set the image width in pixels or percentage.

2. Step 2: Confirm correct attribute name

   Among the options, only width is a valid HTML attribute for image sizing.

3. Final Answer:

   width -> Option A

4. Quick Check:

   Image width attribute = width [OK]

Hint: Use width or height attributes for quick sizing [OK]

Common Mistakes:

• Confusing size with width
• Using CSS property names as HTML attributes
• Trying to use scale which is not valid

2. Which of the following is the correct way to set an image width to 200 pixels in HTML?

easy

A. <img src='photo.jpg' width='200px'>

B. <img src='photo.jpg' style='width: 200'>

C. <img src='photo.jpg' width='200'>

D. <img src='photo.jpg' height='200px'>

Solution

1. Step 1: Understand HTML attribute value format

   In HTML, the width attribute expects a number representing pixels without units.

2. Step 2: Check each option

   <img src='photo.jpg' width='200px'> uses '200px' which is invalid for the width attribute. <img src='photo.jpg' width='200'> correctly uses '200' without units. <img src='photo.jpg' style='width: 200'> uses CSS syntax incorrectly inside an attribute. <img src='photo.jpg' height='200px'> sets height, not width.

3. Final Answer:

   <img src='photo.jpg' width='200'> -> Option C

4. Quick Check:

   Width attribute value is number only [OK]

Hint: Use numbers only for width/height attributes, no units [OK]

Common Mistakes:

• Adding 'px' units inside width or height attributes
• Confusing CSS style syntax with HTML attributes
• Setting height instead of width by mistake

3. What will be the visual result of this HTML code?

<img src='flower.jpg' width='150' height='100'>

medium

A. Image not shown due to invalid attributes

B. Image shown with width 150px and height 100px, possibly distorted

C. Image shown with height 100px, width auto to keep ratio

D. Image shown with width 150px, height auto to keep ratio

Solution

1. Step 1: Understand width and height attributes together

   When both width and height are set, the image is forced to those exact dimensions, ignoring original proportions.

2. Step 2: Predict visual effect

   Because the original image ratio may differ, forcing both width and height can distort the image shape.

3. Final Answer:

   Image shown with width 150px and height 100px, possibly distorted -> Option B

4. Quick Check:

   Both width and height set = fixed size, possible distortion [OK]

Hint: Setting both width and height fixes size, may distort image [OK]

Common Mistakes:

• Assuming height auto adjusts when both attributes set
• Thinking image keeps original ratio automatically
• Believing invalid attributes cause image not to show

4. Identify the error in this HTML code for sizing an image:

<img src='cat.png' width='300' height='auto'>

medium

A. Using 'auto' in height attribute is invalid in HTML

B. Using '300' without units in width attribute is invalid

C. Missing closing slash in <img> tag

D. No error, code is correct

Solution

1. Step 1: Check width attribute value

   The width attribute correctly uses the number '300' without units.

2. Step 2: Check height attribute value

   Height attribute does not accept 'auto' as a value in HTML attributes; it only accepts numbers.

3. Final Answer:

   Using 'auto' in height attribute is invalid in HTML -> Option A

4. Quick Check:

   Height attribute must be number, not 'auto' [OK]

Hint: Height and width attributes accept only numbers, no 'auto' [OK]

Common Mistakes:

• Using CSS values like 'auto' in HTML attributes
• Thinking <img> needs closing slash in HTML5
• Thinking width attribute requires 'px' units

5. You want an image to always fill the width of its container but keep its height proportional. Which CSS style should you use?

hard

A. width: auto; height: auto;

B. width: auto; height: 100%;

C. width: 100px; height: 100px;

D. width: 100%; height: auto;

Solution

1. Step 1: Understand responsive image sizing

   Setting width: 100% makes the image fill the container's width.

2. Step 2: Maintain aspect ratio

   Setting height: auto lets the browser calculate height to keep the image's original proportions.

3. Final Answer:

   width: 100%; height: auto; -> Option D

4. Quick Check:

   Width 100% + height auto = responsive proportional image [OK]

Hint: Use width 100% and height auto for proportional responsive images [OK]

Common Mistakes:

• Setting fixed height breaks aspect ratio
• Using auto width with fixed height distorts image
• Setting both width and height fixed loses responsiveness