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element "iframe" undefined - Errors found while checking this document as XHTML 1.0 Strict!


element "iframe" undefined - Errors found while checking this document as XHTML 1.0 Strict!

By : Srikrishna
Date : January 10 2021, 01:45 PM
I think the issue was by ths following , You can't have iframes in XHTML documents. You can have div tags though, and apply overflow:scroll via CSS. This will cause a scrollbar to appear if the content inside them is too big for the dimensions you assign the div.
Just throw whatever content you've got in include/index.html (minus the html/body markup) into the page itself, inside a div:
code :


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Strict XHTML with MIME type "application/xhtml+xml": AJAX / PHP's DOMDocument class fails

Strict XHTML with MIME type "application/xhtml+xml": AJAX / PHP's DOMDocument class fails


By : user3782040
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm quite embarrassed. The AJAX request output breached the strict XHTML rules. Just haven't seen it. The example above would run without problems, because I've stripped some of the flawed HTML code. However: problem solved, own stupidity confirmed...
XHTML 1.0 Strict Error : <select name="url" onchange="document.location.href = this.value">

XHTML 1.0 Strict Error : <select name="url" onchange="document.location.href = this.value">


By : bernard
Date : March 29 2020, 07:55 AM
it fixes the issue From looking around the internet, it sounds like
Errors found while checking this document as XHTML 1.0 Transitional

Errors found while checking this document as XHTML 1.0 Transitional


By : Android_Developer
Date : March 29 2020, 07:55 AM
help you fix your problem The XHTML 1.0 Recommendation itself says, in Compatibility Guidelines, item C 4: “Use external scripts if your script uses < or & or ]]> or --.” The reason is that by XHTML rules, script element content is parsed by normal rules, so those characters are or they may be markup-significant.
Using < for < etc. would fix this as regards to processing XHTML by the book, including general XML processing. But you probably intend to throw your page at various web browsers, and they will generally not do such processing but will handle the page as if it were HTML, and then things would fail.
Valid XHTML: Document type does not allow element "p"; missing one of "object"

Valid XHTML: Document type does not allow element "p"; missing one of "object"


By : geetika gautam
Date : March 29 2020, 07:55 AM
wish of those help I am trying to validate my document as XHTML 1.0 Transitional (W3C). I have the following error:
code :
<h2>Top Four Questions</h2>
<p><a name="tf1" id="tf1"></a>
<p><strong>Q: How much?</strong></p>
<p>We look forward to hearing from you!</p>
</div>
<h2>Top Four Questions</h2>
<p><a name="tf1" id="tf1"></a></p>
<p><strong>Q: How much?</strong></p>
<p>We look forward to hearing from you!</p>
Error code element " " undefined [XHTML 1.0 Strict]

Error code element " " undefined [XHTML 1.0 Strict]


By : Mattews Bueno
Date : March 29 2020, 07:55 AM
To fix this issue header element is part of the HTML 5 doctype hence the error. http://html5doctor.com/the-header-element/ So is nav.
This is valid XHTML since you use xhtml1-strict.
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