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More HTML/JavaScript graphics experimentation, this time with SVG animation . Click/tap and drag in the frame below. Source: <svg id = "mySvg" viewBox = "0 0 400 300" style = "border: solid 1px black; width:100%; aspect-ratio: 4/3" ></svg> <script> var svg = document.getElementById( "mySvg" ), svgViewRect, clientViewRect, // svg and client coordinates currMouseDown = null , mouseDownIdleID = 0 ; const initialMouseTimeout = 250 , fasterMouseTimeout = 25 ; function animate(element, attrName, to, dur, repeatCount, fill = null ) { // animates SVG element attribute from its current value towards "to" value over timespan "dur" var animation = document.createElementNS( "http://www.w3.org/2000/svg" , "animate" ); animation.setAttribute( "attributeName" , attrName); animation.setAttribute( &quo

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