Span are not editable as text

Hello artf, I have replaced "components: el.innerHTML" by "content: el.innerHTML" but the content is still not editable. Here is my code:
' 
let domc            = this.editor.DomComponents;
let textType        = domc.getType("text");'

        domc.addType('span', {
            // Define the Model
            model: textType.model.extend({},
                {
                    isComponent(el) {
                    if (el.tagName === 'SPAN') {
                        // as template.children will return an empty array the traverser
                        // will skip all nodes, therefore attach them as a string (they
                        // will be processed later)
                        return {type: 'Span',
                                src: el.src,
                                tagName: el.tagName.toLowerCase(),
                                // components: el.innerHTML,
                                content: el.innerHTML,

                        }
                    }
                }
            }),
            view: textType.view
        });`

If I keep ` components: el.innerHTML`, text are duplicated.