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I have been working on a small slideshow / public display for a client that uses HTML5 Rock's Slideshow code . I have run into a DOM Exception 12 - a syntax error that is supposedly related to CSS selectors - while monkeying around with it... but I can't trace it back to any changes I made in the code. I am thinking it might be something that was uncovered as I added features. I have traced it down to this object (live version here ): var SlideShow = function(slides) { this._slides = (slides || []).map(function(el, idx) { return new Slide(el, idx); }); var h = window.location.hash; try { this.current = h; } catch (e) { /* squeltch */ } this.current = (!this.current) ? "landing-slide" : this.current.replace('#', ''); if (!query('#' + this.current)) { // if this happens is very likely that someone is coming from // a link with the old permalink format, i.e. #slide24 alert('The format of the permalinks have recently changed. If you are coming ' + 'here from an old external link it\'s very likely you will land to the wrong slide'); this.current = "landing-slide"; } var _t = this; doc.addEventListener('keydown', function(e) { _t.handleKeys(e); }, false); doc.addEventListener('touchstart', function(e) { _t.handleTouchStart(e); }, false); doc.addEventListener('touchend', function(e) { _t.handleTouchEnd(e); }, false); window.addEventListener('popstate', function(e) { if (e.state) { _t.go(e.state, true); } }, false); }; Instantiation of SlideShow() (line 521 in main.js ): var slideshow = new SlideShow(queryAll('.slide')); Calling queryAll('.

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