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I tested the form with the workaround provided above and seems to be working fine on the browsers that you say.
It could be that the attribute target is being overwritten for other property, but we need to have the link to your form, so we can test and inspect why the links are not working on your form.
Hi, This is the link to my form:
If you click on the jotform logo, the link's target is set as _parent, but it opens in a new tab and all browsers.
I checked your website and was able to see the issue that you are describing, when I checked the console I noticed this error:
This is because you are trying to open the links using a different domain within iFrames, here is your currently code:
As you see you have different URLs where you are trying to access to other links, for example, this is the main URL http://www.holaspanishcentre.com/tablet-temp.html, then you have embedded an iFrame with this URL http://www.holaspanishcentre.com/temp/1.html, inside that iFrame you have embedded the JotForms, then not only Google Chrome take this as suspicious, all the we browsers have the same security this is why it does not work on any browser.
As far as I know there is not a way to resolve this problem since this is security that web browsers implement to avoid attacks, here is a link where it is explained as well: http://www.axure.com/c/forum/advanced-prototyping/10479-link-within-iframe-navigate-page-prototype.html.
Now, I copied the link to the first iFrame, this is the link: http://www.holaspanishcentre.com/temp/1.html.
When I tested I noted that the links are opened in the same tab, see here the result:
In order to avoid the web browsers blocking the target _parent you should embed the JotForms directly on your website: http://www.holaspanishcentre.com/tablet-temp.html.
I mean, copy the JotForm's code embedded here: http://www.holaspanishcentre.com/temp/1.html, and paste them here: http://www.holaspanishcentre.com/tablet-temp.html directly, this will allow the target _parent attribute to work properly.
Hope this will help you.