HTML Image Tags and Attributes Quiz

6 Questions

What is the purpose of the 'alt' attribute in the HTML 'img' element?

Provide a textual replacement for the image

Which image format is best suited for simple animations?

GIF

What do the 'sizes' and 'srcset' attributes in HTML 'img' element help with?

Create responsive images

Which CSS property can be used to align an image to the left or right?

float

For which type of graphics is the PNG format best suited?

Simple graphics and transparency

What does the 'crossorigin' attribute in HTML 'img' element control?

Security and privacy settings

Study Notes

HTML Images: Image Tags, Attributes, and Formats

The HTML <img> element is a foundational tool for embedding images into web pages. It allows you to display images, improve your web design, and provide context for your content.

Image Tags

The <img> tag is used to embed an image into your HTML document. It's a self-closing tag that contains attributes, not a closing tag like <a>.

<img src="example.jpg" alt="Example image description">

Required Attributes

The <img> element has two required attributes:

src: Specifies the path to the image file.
alt: Provides a textual replacement for the image, essential for accessibility.

Additional Attributes

width and height: Set the image size before it loads.
crossorigin: Controls CORS settings for security and privacy.
referrerpolicy: Specifies referrer settings for privacy.
sizes and srcset: For responsive images.

Image Formats

HTML doesn't dictate specific image formats, but the widely supported formats are:

JPEG (Joint Photographic Experts Group): Best for photographs, complex scenes, and gradients.
PNG (Portable Network Graphics): Best for simple graphics and transparency.
GIF (Graphics Interchange Format): Best for simple animations.
SVG (Scalable Vector Graphics): Best for scalable vector graphics, not raster images.

To style images, you can use CSS properties such as:

display: Set to inline or inline-block.
float: Left or right alignment.
margin: Spacing around the image.
max-width and max-height: Set to 100% for responsive design.

Accessibility

Provide meaningful, concise alt text for screen readers.
Use the longdesc attribute with caution, since it's deprecated.
Use aria-describedby or aria-details for WAI-ARIA alternatives.

Security and Privacy

Be cautious when using srcset with external images for security.
Limit the visibility of image files within your directory structure.

Other Considerations

Use CSS to style images rather than the align attribute for modern web development.
Optimize images for web performance, using compression tools and appropriate dimensions.
Implement lazy loading for performance improvements.