test

            if (k == kk) { known = true; break; }

        }

        if (!known) {

            toRemove.push_back(k);

            // "position: fixed"/"sticky" is meaningless (and actively

            // harmful) once carried over verbatim: both are defined relative

            // to the *source* page's own viewport/scroll ancestor, which

            // import completely discards -- the element gets re-parented into

            // however many extra Container/Section wrapper widgets this

            // function's caller needed to reconstruct the layout. Keeping it

            // makes a source-page sticky nav bar or fixed banner render

            // pinned to whatever ancestor happens to be scrollable in

            // blogi's own widget tree instead of the page top, floating over

            // unrelated content (found via bautenschutz-wetzlar.de's sticky

            // header, which has this exact rule). Dropping the declaration

            // leaves position at its default ("static"), which is always a

            // safer fallback than reproducing the wrong out-of-flow anchor;

            // any accompanying top/left/right/bottom/z-index becomes inert

            // on a statically positioned element, so nothing else needs to

            // be stripped alongside it.

            if (k == "position") {

                std::string val = v;

                stripImportant(val);

                std::transform(val.begin(), val.end(), val.begin(),

                    [](unsigned char c) { return std::tolower(c); });

                size_t s = val.find_first_not_of(" \t\r\n");

                size_t e = val.find_last_not_of(" \t\r\n");

                val = (s == std::string::npos) ? "" : val.substr(s, e - s + 1);

                if (val == "fixed" || val == "sticky") continue;

            }

            if (!plainDecls.empty()) plainDecls += " ";

            plainDecls += k + ": " + v + ";";

            toRemove.push_back(k);

        }

    }

    for (auto &k : toRemove) props.erase(k);