daggerheart/templates/sheets/items/subclass/features.hbs

<section class='tab {{tabs.features.cssClass}} {{tabs.features.id}}' data-tab='{{tabs.features.id}}'
    data-group='{{tabs.features.group}}'>
    <fieldset class="drop-section" data-type="foundationFeature">
        <legend>
            {{localize "DAGGERHEART.GENERAL.Tabs.foundation"}}
            <a {{disabled source.system.foundationFeature}}>
                <i data-action="addFeature" data-type="foundationFeature"
                    class="fa-solid fa-plus icon-button {{disabled source.system.foundationFeature}}"></i>
            </a>
        </legend>

        <div class="feature-list">
            {{#if source.system.foundationFeature}}
            {{> 'systems/daggerheart/templates/sheets/global/partials/feature-section-item.hbs'
            actionPath='foundationFeature'
            feature=source.system.foundationFeature
            }}
            {{/if}}
        </div>
    </fieldset>

    <fieldset class="drop-section" data-type="specializationFeature">
        <legend>
            {{localize "DAGGERHEART.GENERAL.Tabs.specialization"}}
            <a {{disabled source.system.specializationFeature}}><i data-action="addFeature"
                    data-type="specializationFeature"
                    class="fa-solid fa-plus icon-button {{disabled source.system.specializationFeature}}"></i></a>
        </legend>

        <div class="feature-list">
            {{#if source.system.specializationFeature}}
            {{> 'systems/daggerheart/templates/sheets/global/partials/feature-section-item.hbs'
            actionPath='specializationFeature' feature=source.system.specializationFeature}}
            {{/if}}
        </div>
    </fieldset>

    <fieldset class="drop-section" data-type="masteryFeature">
        <legend>
            {{localize "DAGGERHEART.GENERAL.Tabs.mastery"}}
            <a {{disabled source.system.masteryFeature}}><i data-action="addFeature" data-type="masteryFeature"
                    class="fa-solid fa-plus icon-button {{disabled source.system.masteryFeature}}"></i></a>
        </legend>

        <div class="feature-list">
            {{#if source.system.masteryFeature}}
            {{> 'systems/daggerheart/templates/sheets/global/partials/feature-section-item.hbs'
            actionPath='masteryFeature' feature=source.system.masteryFeature}}
            {{/if}}
        </div>
    </fieldset>
</section>