HTML Checking for Large Sites
Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as iframe.
The seamless
attribute was proposed to be included in the HTML5 spec, but it wasn’t finally accepted, so it’s not a valid attribute for <iframe>
.
An <iframe>
element allows to embed an HTML document inside another HTML document, and its src
attribute is indicated the source URL of the embedded web page. The src
attribute is a required attribute, so it cannot be blank.
Example:
<iframe src="https://example.com/map.html"></iframe>
Learn more:
The <iframe>
element, used to embed another document inside the current document, accepts both attributes width
and height
which must be valid non-negative integers. Percentages are not allowed for these attributes.
Check the iframe spec.
An <iframe>
element allows to embed an HTML document inside another HTML document, and its src
attribute is indicated the source URL of the embedded web page. The query part of that URL contains one or more space characters, which are not allowed, for example:
<iframe src="https://maps.google.it/maps?q=2700 6th Avenue"></iframe>
You should properly escape all space characters as %20
like this:
<iframe src="https://maps.google.it/maps?q=2700%206th%20Avenue"></iframe>
Learn more:
The <iframe>
element, used to embed another document inside the current document, accepts both attributes width
and height
which must be valid non-negative integers. Percentages are not allowed for these attributes.
Check the iframe spec.
<iframe>
tags are used to embed another document within the current document. To indicate the contents of that nested document, you can either use the src
attribute with an URL, or directly provide the contents with the srcdoc
attribute. Examples:
<!-- This will embed a document by its URL -->
<iframe src="https://example.com"></iframe>
<!-- This will embed the contents provided in the srcdoc attribute -->
<iframe srcdoc="<p>some content</p>"></iframe>
<!-- This is invalid -->
<iframe><p>some content</p></iframe>
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