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stroke

......stroke="<paint>": the color of the outline, which can be a solid color or a gradient. The possible values are the same as for ......fill.
......stroke-width="<length>": the width of the stroke.
......stroke-opacity="<0.0 to 1.0>": the opacity of the stroke.0.0 means fully transparent. 1.0 means fully opaque.
......stroke-dasharray="<length>, <length>......": the lengths of the alternating dashes and gaps.
......stroke-dashoffset="<length>": the distance into the dash pattern to start the dash.
......stroke-linecap="{butt|round|square}": the shape at the ends of a line.
......stroke-linejoin="{miter|round|bevel}": the shape at the corners
......stroke-miterlimit="<greater than or equal to 1>": the limit of the miter length, for stroke-linejoin="miter".
                If the limit is exceeded, a 'bevel' join will be used.