json-rust
                                
                                
                                
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                        Logo is 1) invisible and 2) http in https content
Sorry for reporting such silly issues!
Your logo http://terhix.com/doc/json-rust-logo-small.png seems to be the first cause of mixed content warning that I see on the page https://docs.rs/json/0.11.10/json/ which is served over https.
Thanks! I also let that domain drop, I'll need to move it elsewhere.