iframe sandbox with no value

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TomHTML
Rank III - Intermediate
Rank III - Intermediate
Posts: 53
Joined: Sun Feb 04, 2018 10:19 am

iframe sandbox with no value

Post by TomHTML »

I have this iframe element:

Code: Select all

<iframe sandbox="" class="ic-iframe" title="Check Social Share Images" tabindex="-1" src="https://example.com"></iframe>
The validator reports:
The "sandbox" attribute for this "iframe" element (with class="lv-iframe") has an empty or missing value. The expected value is one of the following: an alphanumeric string, no value, or a string.
However, the MDN entry on the sandbox attribute of iframes states that it can be empty to apply all restrictions (on https://developer.mozilla.org/en-US/doc ... ent/iframe):
sandbox
Applies extra restrictions to the content in the frame. The value of the attribute can either be empty to apply all restrictions, or space-separated tokens to lift particular restrictions:
[various attribute values are then listed]
Wouldn't the Validator therefore be incorrect in reporting this as an error?

Many thanks,
Tom
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Albert Wiersch
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Re: iframe sandbox with no value

Post by Albert Wiersch »

Hi Tom,

Thank you for reporting this. It will be fixed in the next update of CSS HTML Validator 2021.

Or you can download the updated config file for 2021/v21 here:
https://www.htmlvalidator.com/2021/htmlvalV210cfg.zip

And for the latest config file for 2020/v20:
https://www.htmlvalidator.com/2020/htmlvalV200cfg.zip

Please see the "readme" file in the above ZIP file for installation instructions.
TomHTML
Rank III - Intermediate
Rank III - Intermediate
Posts: 53
Joined: Sun Feb 04, 2018 10:19 am

Re: iframe sandbox with no value

Post by TomHTML »

Thanks! That seems to fix it.
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