JavaScript tips

 I made an SVG darker using an SVG filter I added the filter to the top-level 'defs' tag:     <defs id="defs4">       <filter id="my-dark-filter"                color-interpolation-filters="sRGB">         <feColorMatrix type="matrix"                         values="1 0 0 0 -0.5                                 0 1 0 0 -0.5                                0 0 1 0 -0.5                                0 0 0 1 0"/>       </filter> The values in the fifth column in the matrix vary from 1 for all-white to -1 for all-black. I then called the filter from the top-level 'g' tag:     <g filter="url(#my-dark-filter)" id="layer1"> I got the idea from 'stackoverflow.com' The SVG came from 'openclipart.org' There are more tips at:  bbingo.xyz/techtips/

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