Default values for fields of type "iframe" are not saved

Any news on this? I'm seeing the same thing: the frameborder is rendered even though I configured the field with "no frameborder". It looks like the configuration is stored correctly though, because in the field config yml (field.field.paragraph.iframe.field_iframe.yml in my case) it says frameborder: '0'. I wonder if IframeDefaultFormatter::iframe_iframe() is doing its job properly.

Indeed, the frameborder disappears when you change this...

    if (!empty($item->frameborder) && $item->frameborder > 0) {
        $options['frameborder'] = (int)$item->frameborder;
    }

...to this...

    $options['frameborder'] = $item->getValue('values')['frameborder'];

...around line 131 of iframe/src/Plugin/Field/FieldFormatter/IframeDefaultFormatter.php. I have no time to write a patch at the moment, but it looks like the module can use a bit of cleaning up.

Can you verify that you mean the manage/ page?

Please try dev-version:
On my page "/admin/structure/types/manage/story/fields/node.story.field_iframe9" I can save and change the "frameborder", the scrolling", and so on. It remembers all changes and shows me the changed setting on reedit.

What is Your setting at:
* /admin/structure/types/manage/story/fields/node.story.field_iframe9
* and manage form display /admin/structure/types/manage/story/form-display on iframe-field behind "wheel"

In fact, I tested this on the /admin/structure/types/manage/page/fields/node.page.field_iframe_test page (node field configuration form), as well as the /admin/structure/paragraphs_type/iframe/fields/paragraph.iframe.field_iframe page (paragraph field configuration form). Both behaved the same.

I updated to the dev version (commit 11a5ae0) but that didn't solve the problem. The change described in #3 does work. I guess you always have to define $options['frameborder'], even if it is 0, to make sure the frameBorder attribute is set on the iframe element.

I tested this with Drupal 8.2.6, in both Firefox and Chrome.

It turns out it's more complicated than I thought. When you change the frameborder field setting after content has been saved, the value of $item->frameborder remains the same. I guess that is what LpSolit meant when he wrote that the default value is not saved. (It is in fact saved, but not used.)

I give up, I'll just use CSS instead.

I confirm this. I can't apply a scrolling="no" to my ifram!

The same problem with Width and Height default values

Facing problems in saving default values like height, width here... Any idea how to fix this?

test again.

Added "massageFormValues()" function which acts as "presave" Function.

Problem was, that the user are only allowed to save some attributes (title, width, height)
The admin-values (frameborder, etc) are not saved and were not available to node-rendering of the iframe-field.

Now the user-values will be enhanced by the admin-values before saving.