176 lines
6.0 KiB
HTML
176 lines
6.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>SVG size test</title>
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<style>
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body {
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margin: 30px;
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font-family: sans-serif;
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}
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#tests {
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display: grid;
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grid-template-columns: repeat(4, 1fr);
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grid-gap: 30px;
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}
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#tests div:hover {
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opacity: 1 !important;
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}
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#tests p {
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text-decoration: underline dotted black;
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}
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svg {
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background: lightgrey;
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}
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</style>
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</head>
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<body>
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<h1>SVG size test</h1>
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<p>The grey boxes below are <code><svg></code> elements.</p>
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<p>All SVGs in each row should have the exact same size.</p>
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<p>Each row has its own viewBox width and height: <code>viewBox="0 0 width height"</code>.</p>
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<p>Each column has its own width/height styling. For example, <code>style="width: 200px; height: auto;"</code>.</p>
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<p>The first column has both an explicit widht and an explicit height, so there's not much that can go wrong there. It acts as a reference.</p>
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<p>The first row has integer viewBox width and height. Firefox then sizes all SVGs correctly.</p>
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<p>The remaining rows have at least one non-integer viewBox width and height. Firefox then sizes the SVGs a bit wrong.</p>
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<p>Chrome, Safari and Edge seem to pass all tests.</p>
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<p id="summary"></p>
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<div id="tests"></div>
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<script>
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const testsElement = document.getElementById("tests");
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const summaryElement = document.getElementById("summary");
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// Turn for instance `2.3` into `230` (px). Round to avoid floating point
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// issues.
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const scale = (number) => Math.round(100 * number);
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const widths = [2, 2.3, 2.5, 2.8];
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const heights = [3, 3.3, 3.5, 3.8];
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let numPassed = 0;
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let numFailed = 0;
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for (const width of widths) {
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for (const height of heights) {
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const variations = [
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{width, height},
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{width: "auto", height},
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{width, height: "auto"},
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{width: "auto", height: "auto"},
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];
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for (const variation of variations) {
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const cellElement = document.createElement("div");
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const titleElement = document.createElement("h2");
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titleElement.appendChild(makeTitle(width, height, variation));
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const sizeElement = document.createElement("p");
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const svgWrapperElement = document.createElement("div");
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svgWrapperElement.style.width =
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variation.width === "auto" && variation.height === "auto"
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? `${scale(width)}px`
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: "auto";
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const svgElement = document.createElementNS("http://www.w3.org/2000/svg", "svg");
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svgElement.setAttribute("viewBox", `0 0 ${width} ${height}`);
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svgElement.style.width =
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typeof variation.width === "number"
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? `${scale(variation.width)}px`
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: variation.width;
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svgElement.style.height =
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typeof variation.height === "number"
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? `${scale(variation.height)}px`
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: variation.height;
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svgWrapperElement.appendChild(svgElement);
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cellElement.appendChild(titleElement);
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cellElement.appendChild(sizeElement);
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cellElement.appendChild(svgWrapperElement);
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testsElement.appendChild(cellElement);
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const rect = svgElement.getBoundingClientRect();
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const actual = {
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width: Math.round(rect.width),
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height: Math.round(rect.height),
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};
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const expected = {
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width: scale(width),
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height: scale(height),
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};
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const passed =
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actual.width === expected.width &&
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actual.height === expected.height;
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const icon = passed ? "✔" : "✘";
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const iconText = passed ? "PASS" : "FAIL";
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const expectedText = passed ? "" : `\nExpected size: ${expected.width}x${expected.height}`;
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sizeElement.textContent = `${icon} ${actual.width}x${actual.height}`;
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sizeElement.title = `${iconText}. Actual size, as measured by element.getBoundingClientRect().${expectedText}`;
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sizeElement.style.color = passed ? "lime" : "red";
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sizeElement.style.fontWeight = passed ? "normal" : "bold";
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cellElement.style.opacity = passed ? 0.5 : 1;
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if (passed) {
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numPassed++;
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} else {
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numFailed++;
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}
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}
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}
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}
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const numTotal = numPassed + numFailed;
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const passed = numFailed === 0;
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const icon = passed ? "✔" : "✘";
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summaryElement.textContent = `${icon} ${numPassed}/${numTotal} tests passed.`;
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summaryElement.style.color = passed ? "lime" : "red";
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summaryElement.style.fontWeight = "bold";
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function makeTitle(width, height, variation) {
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const fragment = document.createDocumentFragment();
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const first = document.createElement("abbr");
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first.textContent = `${width}/${height}`;
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first.title = `SVG viewBox width/height: viewBox="0 0 ${width} ${height}"`;
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const separator = document.createTextNode(" | ");
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const second = document.createElement("abbr");
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const widthString = typeof variation.width === "number" ? "px" : variation.width;
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const heightString = typeof variation.height === "number" ? "px" : variation.height;
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second.textContent = `${widthString}/${heightString}`;
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const widthExplanation =
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typeof variation.width === "number"
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? "explicit width (px)"
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: `${variation.width} width`
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const heightExplanation =
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typeof variation.height === "number"
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? "explicit height (px)"
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: `${variation.height} height`
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second.title = `${widthExplanation}, ${heightExplanation}`;
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fragment.appendChild(first);
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fragment.appendChild(separator);
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fragment.appendChild(second);
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return fragment;
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}
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</script>
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</body>
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</html>
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