primeng
Version:
[](https://opensource.org/licenses/MIT) [](https://badge.fury.io/js/primeng) [=\"toggle($event)\" (keydown.enter)=\"toggle($event)\" [attr.aria-controls]=\"id + '-content'\" [attr.aria-expanded]=\"!collapsed\">\n <ng-container *ngTemplateOutlet=\"legendContent\"></ng-container>\n </a>\n </ng-container>\n <ng-template #legendContent>\n <span class=\"ui-fieldset-toggler pi\" *ngIf=\"toggleable\" [ngClass]=\"{'pi-minus': !collapsed,'pi-plus':collapsed}\"></span>\n <span class=\"ui-fieldset-legend-text\">{{legend}}</span>\n <ng-content select=\"p-header\"></ng-content>\n </ng-template>\n </legend>\n <div [attr.id]=\"id + '-content'\" class=\"ui-fieldset-content-wrapper\" [@fieldsetContent]=\"collapsed ? {value: 'hidden', params: {transitionParams: transitionOptions, height: '0'}} : {value: 'visible', params: {transitionParams: animating ? transitionOptions : '0ms', height: '*'}}\" \n [attr.aria-labelledby]=\"id\" [ngClass]=\"{'ui-fieldset-content-wrapper-overflown': collapsed||animating}\" 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