html-sanitizer
                                Provides an object-oriented API to sanitize untrusted HTML input for safe insertion into a document's DOM.
                            
                        How to download and setup html-sanitizer
Open terminal and run command
                                            git clone https://github.com/symfony/html-sanitizer.git
                                        
                                        git clone is used to create a copy or clone of html-sanitizer 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 html-sanitizer https://github.com/symfony/html-sanitizer/archive/master.zip
Or simply clone html-sanitizer with SSH
                                            [email protected]:symfony/html-sanitizer.git                                    
                                    If you have some problems with html-sanitizer
You may open issue on html-sanitizer support forum (system) here: https://github.com/symfony/html-sanitizer/issuesSimilar to html-sanitizer repositories
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