Tooltips for SVG Charts
SVG chart tooltips are usually built as an HTML overlay positioned from pointer events on the chart's data elements.
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HTML Overlay vs In-SVG Tooltips
Tooltips rendered as absolutely positioned HTML elements over the chart get full CSS layout, text wrapping, and styling for free, whereas tooltips built from SVG text and rect elements must handle their own sizing and wrapping manually but stay contained within the SVG document.
- HTML overlays get CSS layout, wrapping, and styling for free
- In-SVG tooltips require manual sizing and text wrapping work
- In-SVG tooltips do stay self-contained within the SVG document
Improving Hit Targets for Small Marks
Small data marks like scatter points are hard to hover precisely, so a common technique adds an invisible larger circle or rect over each mark with a transparent fill, giving the pointer a generous hit target without changing the chart's visual appearance.
- Small marks like scatter points are difficult to hover precisely
- An invisible larger shape over each mark widens the hit target
- A transparent fill keeps the chart's appearance completely unchanged
Frequently Asked Questions
Should chart tooltips be HTML or SVG elements?
HTML overlays are usually easier since they get CSS layout and text wrapping for free, while in-SVG tooltips make sense when the chart must remain a self-contained file.
How do I make small data points easier to hover?
Add an invisible larger circle or rect with a transparent fill over each mark, which widens the pointer hit target without altering the visible chart.
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