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Fix Angular error NG0910 by making the affected iframe’s security attributes static in the template. If the policy needs to change, render a different iframe for each policy instead of dynamically updating those attributes on one iframe.
What triggers NG0910?
Angular reports NG0910 when a property or attribute binding dynamically sets any of these iframe attributes:
sandboxallowallowFullscreenreferrerPolicycspfetchPrioritycredentialless
Both [sandbox] and [attr.sandbox] are disallowed. A directive host binding on the iframe can trigger the same error, even if the template markup itself looks static. Angular’s NG0910 error reference explains that these attributes affect the iframe’s security setup, so they must be present when the element is created and remain unchanged for that instance.
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How to fix it with a static attribute
If one policy applies, replace the dynamic binding with a literal template attribute. For example, change:
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<iframe [sandbox]="'allow-scripts'" src="…"></iframe>to:
<iframe sandbox="allow-scripts" src="…"></iframe>Apply the same approach to any of the other listed attributes. Choose values according to the embedded content’s requirements; Angular’s diagnostic does not prescribe one policy for every application.
How to handle a policy that depends on a condition
When different states need different iframe policies, use conditional rendering to create separate iframe elements. Give each branch its own static attribute value:
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@if (someConditionA) {
<iframe sandbox="allow-scripts" src="…"></iframe>
} @else if (someConditionB) {
<iframe sandbox="allow-forms" src="…"></iframe>
} @else {
<iframe sandbox="allow-popups" src="…"></iframe>
}Angular also documents @switch for conditional rendering. The important point is that each branch creates an iframe whose security attributes are static for that element’s lifetime.
To locate a less obvious cause, check the iframe template identified in the error and then inspect directives attached to it for host bindings. Remove dynamic bindings for every listed attribute, not just sandbox.
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Keep the iframe URL issue separate
NG0910 concerns dynamic bindings for the listed security attributes; it is not an error about the iframe’s src. Angular treats src as a resource URL context because the browser may load external content that can execute code. Generic string sanitization cannot make an arbitrary resource URL safe. See Angular’s resource URL error reference.
For a URL your application constructs and validates, Angular provides DomSanitizer.bypassSecurityTrustResourceUrl as an explicit trust operation. It is not a sanitizer. Do not pass user-supplied URLs to it: that could allow arbitrary content, including malicious scripts, to load. The DomSanitizer API documentation describes this trust bypass.
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Making an iframe security attribute static addresses NG0910, but does not make an untrusted src safe. Likewise, changing how you trust a resource URL does not remove the static-attribute requirement.
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Angular treats template values as untrusted by default and sanitizes them in applicable HTML and URL contexts. Resource URLs are different because they can load executable external content. Angular recommends Content Security Policy (CSP) and Trusted Types as additional application-level protections; neither replaces the NG0910 fix. See the Angular security guide.
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