var selector=document.querySelectorAll('.selected_icon'); console.log(selector);

 <div class="menu-icon-bar"> <div class="material-icons menu-icon select selected_icon" > format_bold</div> <div class="material-icons menu-icon select selected_icon">format_italic</div> <div class="material-icons menu-icon select selected_icon">format_italic</div> <div class="material-icons menu-icon select selected_icon">format_underlined</div> <div class="material-icons menu-icon select selected_icon">content_cut</div> <div class="material-icons menu-icon select selected_icon">content_copy</div> <div class="material-icons menu-icon select selected_icon">content_paste</div> <select class="font_family_selector"> <option value="Hello" selected>Hello</option> <option value="Hello1">Hello2</option> <option value="Hello3">Hello3</option> <option value=""></option> </select> <div class="material-icons menu-icon select selected_icon ">format_align_left</div> <div class="material-icons menu-icon select selected_icon">format_align_right</div> <div class="material-icons menu-icon select selected_icon">format_align_justify</div> <div class="material-icons menu-icon select selected_icon">format_color_text</div> <div class="material-icons menu-icon select selected_icon">format_color_fill</div> </div>