>>> "JMM" == Juan Manuel Macías <maciaschain@posteo.net> writes:

Hola Juan

> I think the problem is how the exporter understands the url string.
> Note that this:

> @@html:<a href="https://www.mpic.de/4747361/risk-calculator" target="_blank">Simulador de riesgo con más detalle</a>@@

> [[https://www.mpic.de/4747361/risk-calculator target="_blank"][Simulador de riesgo con más detalle]]

> is exported like this:

> <p>
> <a href="https://www.mpic.de/4747361/risk-calculator" target="_blank">Simulador de riesgo con más detalle</a>
> </p>

> <p>
> <a href="https://www.mpic.de/4747361/risk-calculator%20target=%22_blank%22">Simulador de riesgo con más detalle</a>
> </p>

> The second link is wrong formatted. A dirty solution could be:

> #+BIND: org-export-filter-final-output-functions (correct-target-blank)
> #+begin_src emacs-lisp :exports results :results none

>   (defun correct-target-blank (text backend info)
>     (when (org-export-derived-backend-p backend 'html)
>       (replace-regexp-in-string "%20target=%22_blank%22\""  "\" target=\"_blank\"" text)))
> #+end_src

> Best regards,

Thanks that works, but not for link in a list. The only solution 
seems to be this one



#+attr_html: :target _blank
[[https://www.zeit.de/wissen/gesundheit/2020-11/coronavirus-aerosols-infection-risk-hotspot-interiors][Risk  simulator]]


#+attr_html: :target _blank
[[https://www.mpic.de/4747361/risk-calculator][Risk simulator with more details]]

      1. RocketBook


         + Book A4
           #+attr_html: :target _blank
           [[https://www.amazon.es/Rocketbook-Everlast-Notebook-riutilizzabile-Esecutivo/dp/B071Y3MSRK/ref=sr_1_5?__mk_es_ES=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=Rocketbook&qid=1607847519&sr=8-5&th=1][Book A4]]

         a. Book A4
            #+attr_html: :target _blank
            [[https://www.amazon.es/Rocketbook-Everlast-Notebook-riutilizzabile-Esecutivo/dp/B071Y3MSRK/ref=sr_1_5?__mk_es_ES=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=Rocketbook&qid=1607847519&sr=8-5&th=1][Book A4]]