What is the difference between allowfullscreen and allow="fullscreen"?
Answers:
The
allowfullscreen
attribute and theallow="fullscreen"
attribute are both used in HTML to control fullscreen permissions for embedded content (like iframes), but they are used in slightly different contexts and have different implications.allowfullscreen
Attribute:- Type: Boolean Attribute
- Usage: It is used as a standalone attribute on an
<iframe>
element. - Example:
<iframe src="example.html" allowfullscreen></iframe>
- Functionality: When present, it allows the content inside the iframe to be viewed in fullscreen mode. If it is not present, fullscreen mode is disabled for that iframe.
- Standard: It is a standard attribute applied directly on iframe tags, recognized by browsers.
allow="fullscreen"
Attribute:- Type: Feature Policy (Permission) Attribute
- Usage: It is part of the
allow
attribute and can contain multiple permissions separated by a semicolon. - Example:
<iframe src="example.html" allow="fullscreen; autoplay"></iframe>
- Functionality: This provides a more granular permission control, allowing you to specify various features that the iframe content can use. The
fullscreen
permission within theallow
attribute serves the same purpose asallowfullscreen
, but it can also be combined with other permissions. - Standard: This is part of the newer specification for the
<iframe>
element, enabling broader permission management.
Key Differences:
-
Syntax and Structure:
allowfullscreen
is a standalone attribute.allow="fullscreen"
is part of a more comprehensive permission system that can include multiple permissions.
-
Compatibility:
- All browsers that support iframes recognize the
allowfullscreen
attribute. allow
with permission specifications may not be supported in all older browsers, though modern browsers largely accept it.
- All browsers that support iframes recognize the
-
Usage Flexibility:
- If you need to only enable fullscreen mode for an iframe, using
allowfullscreen
is straightforward. - If you need to specify multiple permissions (like autoplay, camera access, etc.), using
allow
withfullscreen
is more appropriate.
- If you need to only enable fullscreen mode for an iframe, using
Overall, while both provide similar functionality regarding fullscreen capabilities, the
allow
attribute offers a more flexible and expandable approach, especially when additional permissions are needed for the embedded content.
Related Questions:
- What browsers support allowfullscreen?
- Are there any security concerns with using allowfullscreen?
- What does allowfullscreen do?
- How does allowfullscreen work in HTML?
- What is the purpose of allow='fullscreen'?
- Can I use both allowfullscreen and allow='fullscreen' together?
- How do I enable fullscreen mode in a video player?
- What is the syntax for the allow attribute in iframes?
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