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Added tabIndex to default to zero
empty string is also accepted as well.
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@ -234,7 +234,7 @@ $.Viewer = function( options ) {
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style.left = "0px";
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style.left = "0px";
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}(this.canvas.style));
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}(this.canvas.style));
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$.setElementTouchActionNone( this.canvas );
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$.setElementTouchActionNone( this.canvas );
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this.canvas.tabIndex = options.tabIndex || 0 || "" ;
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this.canvas.tabIndex = (options.tabIndex === undefined ? 0 : options.tabIndex);
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//the container is created through applying the ControlDock constructor above
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//the container is created through applying the ControlDock constructor above
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this.container.className = "openseadragon-container";
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this.container.className = "openseadragon-container";
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