Opening links in new tab in HTML - Performance & Optimization

Performance: Opening links in new tab

LOW IMPACT

This affects user interaction responsiveness and perceived page load speed when opening external content.

Opening external links without blocking the current page

HTML

<a href="https://example.com" target="_blank" rel="noopener noreferrer">Visit Example</a>

Opens link in a new tab, keeping current page active and responsive.

📈 Performance GainNon-blocking interaction, improves INP

Opening external links without blocking the current page

HTML

<a href="https://example.com">Visit Example</a>

Opening links in the same tab causes the current page to unload, blocking user interaction and delaying return.

📉 Performance CostBlocks interaction until new page loads, increasing INP

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
Link opens in same tab	Minimal	0	0	[!] OK but blocks interaction
Link opens in new tab with target="_blank"	Minimal	0	0	[OK] Keeps page responsive

Rendering Pipeline

Opening links in a new tab does not affect rendering of the current page but improves interaction responsiveness by avoiding page unload.

→Interaction Handling

⚠️ BottleneckPage unload and reload blocking user input

Core Web Vital Affected

INP

This affects user interaction responsiveness and perceived page load speed when opening external content.

Optimization Tips

1Use target="_blank" to open links in new tabs and keep the current page responsive.

2Always add rel="noopener noreferrer" with target="_blank" for security and performance.

3Opening links in the same tab blocks interaction and delays user input responsiveness.

Performance Quiz - 3 Questions

What is the main performance benefit of using target="_blank" on links?

A It prevents blocking the current page during navigation

B It reduces the page's initial load time

C It decreases the number of DOM nodes

D It improves CSS selector performance

DevTools: Performance

How to check: Record a session while clicking a link that opens in the same tab vs new tab; observe main thread activity and input responsiveness.

What to look for: Look for main thread blocking and input delay during page unload and load for same-tab links; new tab links show no blocking on current page.

Practice

1. Which attribute in an HTML <a> tag makes the link open in a new browser tab?

easy

A. open="new"

B. href="_blank"

C. rel="new_tab"

D. target="_blank"

Solution

1. Step 1: Understand the purpose of the target attribute

   The target attribute in an <a> tag controls where the linked document opens.

2. Step 2: Identify the correct value for opening in a new tab

   Using target="_blank" tells the browser to open the link in a new tab or window.

3. Final Answer:

   <a href="url" target="_blank"> -> Option D

4. Quick Check:

   Open link in new tab = target="_blank" [OK]

Hint: Use target="_blank" to open links in new tabs [OK]

Common Mistakes:

• Using href="_blank" instead of target
• Using rel attribute to open new tab
• Using open="new" which is invalid

2. Which of the following is the correct syntax to open a link in a new tab with security best practices?

easy

A. <a href="https://example.com" target="_blank" rel="noopener noreferrer">Link</a>

B. <a href="https://example.com" target="_blank">Link</a>

C. <a href="https://example.com" rel="noopener noreferrer">Link</a>

D. <a href="https://example.com" target="new" rel="noopener">Link</a>

Solution

1. Step 1: Use target="_blank" to open link in new tab

   This attribute opens the link in a new tab or window.

2. Step 2: Add rel="noopener noreferrer" for security

   This prevents the new page from accessing the original page via JavaScript, protecting against security risks.

3. Final Answer:

   <a href="https://example.com" target="_blank" rel="noopener noreferrer">Link</a> -> Option A

4. Quick Check:

   New tab + security = target="_blank" + rel="noopener noreferrer" [OK]

Hint: Always add rel="noopener noreferrer" with target="_blank" [OK]

Common Mistakes:

• Omitting rel attribute causing security risk
• Using target="new" instead of _blank
• Using rel without target="_blank"

3. What will happen when the following HTML code is clicked?

<a href="https://openai.com" target="_blank">Visit OpenAI</a>

medium

A. The link opens in a new tab.

B. The link opens in the same tab.

C. The link does not open anywhere.

D. The link opens in a new window but not a tab.

Solution

1. Step 1: Check the target attribute value

   The attribute target="_blank" instructs the browser to open the link in a new tab or window.

2. Step 2: Understand browser behavior

   Most modern browsers open links with target="_blank" in a new tab by default.

3. Final Answer:

   The link opens in a new tab. -> Option A

4. Quick Check:

   target="_blank" means new tab [OK]

Hint: target="_blank" opens link in new tab by default [OK]

Common Mistakes:

• Thinking it opens in the same tab
• Confusing new window with new tab
• Assuming no action happens without rel attribute

4. Identify the error in this HTML snippet if the goal is to open the link in a new tab securely:

<a href="https://example.com" target="blank">Example</a>

medium

A. href attribute is missing protocol.

B. Missing rel="noopener noreferrer" attribute.

C. Incorrect target value; should be "_blank" with underscore.

D. The <a> tag is not closed properly.

Solution

1. Step 1: Check the target attribute value

   The value is "blank" but it must be "_blank" with an underscore to open in a new tab.

2. Step 2: Confirm other attributes

   While adding rel="noopener noreferrer" is recommended for security, the main error preventing new tab opening is the wrong target value.

3. Final Answer:

   Incorrect target value; should be "_blank" with underscore. -> Option C

4. Quick Check:

   target must be "_blank" with underscore [OK]

Hint: target="_blank" needs underscore, not just "blank" [OK]

Common Mistakes:

• Using target="blank" without underscore
• Forgetting rel attribute for security
• Assuming missing protocol breaks new tab

5. You want to create a navigation menu where all external links open in new tabs securely, but internal links open in the same tab. Which HTML snippet correctly applies this?

hard

A. <a href="/about" target="_blank">About</a> <a href="https://external.com" target="_blank">External</a>

B. <a href="/about">About</a> <a href="https://external.com" target="_blank" rel="noopener noreferrer">External</a>

C. <a href="/about" target="_blank" rel="noopener noreferrer">About</a> <a href="https://external.com">External</a>

D. <a href="/about" rel="noopener noreferrer">About</a> <a href="https://external.com" target="blank" rel="noopener">External</a>

Solution

1. Step 1: Identify internal vs external link behavior

   Internal links (like "/about") should open in the same tab, so no target attribute is needed.

2. Step 2: Apply new tab and security attributes to external links

   External links should use target="_blank" and rel="noopener noreferrer" for security and to open in new tabs.

3. Final Answer:

   <a href="/about">About</a> <a href="https://external.com" target="_blank" rel="noopener noreferrer">External</a> -> Option B

4. Quick Check:

   Internal same tab, external new tab + security [OK]

Hint: Use target and rel only on external links [OK]

Common Mistakes:

• Adding target="_blank" to internal links unnecessarily
• Using target="blank" without underscore
• Omitting rel attribute on external links