Global attributes in HTML - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are global attributes in HTML?

Global attributes are special attributes that can be used on any HTML element to add extra information or control behavior.

beginner

Name three common global attributes in HTML.

Three common global attributes are:
1. id - unique identifier
2. class - groups elements
3. style - inline CSS styling

intermediate

What does the tabindex global attribute do?

The tabindex attribute controls the order in which elements receive keyboard focus when pressing the Tab key. It helps with keyboard navigation.

intermediate

How does the aria-label attribute help users?

The aria-label attribute provides a text label for elements, especially for screen readers. It improves accessibility by describing elements that might not have visible text.

beginner

Can the style attribute be used on any HTML element? Why?

Yes, the style attribute is a global attribute and can be used on any HTML element to apply CSS styles directly to that element.

Which of the following is NOT a global attribute in HTML?

A id

B href

C class

D style

href is an attribute specific to <a> and some other elements, not a global attribute.

What does the hidden global attribute do?

A Makes the element invisible and not focusable

B Changes the text color

C Adds a tooltip

D Makes the element editable

The hidden attribute hides the element from view and removes it from keyboard navigation.

Which global attribute helps improve accessibility by labeling elements for screen readers?

A class

B style

C aria-label

D id

aria-label provides descriptive text for screen readers.

How can you group multiple elements for styling or scripting?

A Using the <code>class</code> attribute

B Using the <code>id</code> attribute

C Using the <code>style</code> attribute

D Using the <code>tabindex</code> attribute

class groups elements so CSS or JavaScript can target them together.

Which global attribute controls keyboard focus order?

A hidden

B style

C aria-label

D tabindex

tabindex sets the order elements receive focus when tabbing.

Explain what global attributes are and why they are useful in HTML.

Think about attributes that work everywhere in HTML.

Describe how the aria-label and tabindex attributes improve accessibility.

Focus on how these help people who use keyboards or screen readers.

Practice

1. Which of the following is a global attribute that can be used on any HTML element to give it a unique identifier?

easy

A. alt

B. src

C. id

D. href

Solution

1. Step 1: Understand what a global attribute is

   Global attributes can be used on any HTML element regardless of its type.

2. Step 2: Identify the attribute that uniquely identifies elements

   The id attribute assigns a unique identifier to an element, usable on all elements.

3. Final Answer:

   id -> Option C

4. Quick Check:

   Unique element identifier = id [OK]

Hint: Use id for unique element IDs on any tag [OK]

Common Mistakes:

• Confusing src as global (it's for images, scripts)
• Thinking href works on all elements (only links)
• Using alt outside images

2. Which is the correct way to add a tooltip text to an HTML element using a global attribute?

easy

A. tooltip="Info"

B. title="Info"

C. alt="Info"

D. data-tooltip="Info"

Solution

1. Step 1: Identify the attribute that shows tooltip text

   The title attribute is a global attribute that shows a tooltip on hover.

2. Step 2: Check the syntax correctness

   title="Info" is the correct syntax to add tooltip text.

3. Final Answer:

   title="Info" -> Option B

4. Quick Check:

   Tooltip attribute = title [OK]

Hint: Use title for tooltips on any element [OK]

Common Mistakes:

• Using non-existent tooltip attribute
• Confusing alt (only for images)
• Using custom data attributes for tooltips without scripts

3. What will be the visible effect of this HTML snippet in a browser?

<div hidden>Secret message</div><div>Visible message</div>

medium

A. Only 'Visible message' is visible

B. Both messages are visible

C. Only 'Secret message' is visible

D. No messages are visible

Solution

1. Step 1: Understand the hidden attribute effect

   The hidden global attribute hides the element from display in the browser.

2. Step 2: Analyze the snippet output

   The first <div> has hidden, so 'Secret message' is hidden. The second <div> is visible.

3. Final Answer:

   Only 'Visible message' is visible -> Option A

4. Quick Check:

   hidden hides element = Only visible message shown [OK]

Hint: hidden hides element from view instantly [OK]

Common Mistakes:

• Thinking hidden just makes element transparent
• Assuming hidden elements take space on page
• Confusing hidden with CSS display:none

4. Identify the error in this HTML snippet:

<button id="btn1" class="btn" hidden="false">Click me</button>

medium

A. The button element cannot have global attributes

B. The id attribute value is invalid

C. The class attribute cannot be used with hidden

D. The hidden attribute should not have a value

Solution

1. Step 1: Review the hidden attribute usage

   The hidden attribute is a boolean attribute and should not have a value like "false"; presence means true.

2. Step 2: Check other attributes for correctness

   id and class are valid global attributes on button. The error is only with hidden="false".

3. Final Answer:

   The hidden attribute should not have a value -> Option D

4. Quick Check:

   Boolean attributes have no value = hidden no value [OK]

Hint: Boolean global attributes never have values, just presence [OK]

Common Mistakes:

• Giving boolean attributes values like "true" or "false"
• Thinking hidden="false" means visible
• Believing class and hidden conflict

5. You want to store extra information about a product in an HTML element without affecting its display or behavior. Which global attribute should you use?

hard

A. data-product-info

B. title

C. hidden

D. class

Solution

1. Step 1: Understand storing extra info in HTML

   Custom data attributes starting with data- allow storing extra info without affecting display or behavior.

2. Step 2: Identify the correct attribute for product info

   data-product-info is a valid custom data attribute to hold product details invisibly.

3. Final Answer:

   data-product-info -> Option A

4. Quick Check:

   Extra info storage = data-* attributes [OK]

Hint: Use data-* attributes to store hidden info [OK]

Common Mistakes:

• Using title which shows visible tooltip
• Using hidden which hides element
• Using class which is for styling, not data