incubator-popup
                                <incubator-popup> is a Web Component providing an easy way to hide extra content from your webpage and show them to the user whenever they need them.
                            
                        How to download and setup incubator-popup
Open terminal and run command
                                            git clone https://github.com/vaadin/incubator-popup.git
                                        
                                        git clone is used to create a copy or clone of incubator-popup repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with incubator-popup https://github.com/vaadin/incubator-popup/archive/master.zip
Or simply clone incubator-popup with SSH
                                            [email protected]:vaadin/incubator-popup.git                                    
                                    If you have some problems with incubator-popup
You may open issue on incubator-popup support forum (system) here: https://github.com/vaadin/incubator-popup/issuesSimilar to incubator-popup repositories
Here you may see incubator-popup alternatives and analogs
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