the following is working for me.Java:public class Style {    public String style = "/content/dam/we-retail/en/experiences/arctic-surfing-in-lofoten/camp-fire.jpg";}HTL:style="background-image: url('${ fv.style @ context='styleString'}')

Indeed, this is weird. I guess the XSS-api validates that this is an xss-issue.I raised this Sling issue to who is right https://issues.apache.org/jira/browse/SLING-6490

What is the attribute value you are trying to output?

<section class="header-page" data-sly-attribute.style="${header.cssStyle @ context='styleString' }" data-sly-use.header="com.acme.foo.Header"> </section>

Specify @ context='styleString' in your component.For style attributes you need to see this manually.More info here: https://docs.adobe.com/docs/en/htl/docs/expression-language.html

Indeed syntax looks ok, is there no <ul> displayed?

Don't this is possible, this is not available on the Resource-API.

AFAIK you can only share assets with the creative cloud.See here the link: https://docs.adobe.com/docs/en/aem/6-2/administer/integration/configure-assets-cc-integration.html

Not on sure, what do you have this requirement?

You can't specify arguments like ${log.info("hello")}You can only make log statements via Java or JS code.