(function(){ "use strict"; function byteArrayToHex(arrayBuffer){ const chunks = []; (new Uint32Array(arrayBuffer)).forEach(function(num){ chunks.push(num.toString(16)); }); return chunks.map(function(chunk){ return "0".repeat(8 - chunk.length) + chunk; }).join(""); } const container = document.getElementById("tests"); const iframe = document.getElementById("iframe"); const template = document.querySelector(".test"); template.parentElement.removeChild(template); function getElements(){ const doc = iframe.contentDocument; return Array.from(doc.querySelectorAll(".testRect")); } function formatNumber(number){ const str = number.toString(); return "" + str.substring(0, str.length - 2) + "" + str.substring(str.length - 2); } const properties = ["x", "y", "width", "height", "top", "left", "right", "bottom"]; async function performTest(output, callback){ const rects = getElements().map(function(element){ return { name: element.dataset.name, data: callback(element) }; }); const data = new Float64Array(rects.length * properties.length); rects.forEach(function(rect, i){ properties.forEach(function(property, j){ data[i * properties.length + j] = rect.data[property]; }); }); const hash = await crypto.subtle.digest("SHA-256", data); output.querySelector(".hash").textContent = byteArrayToHex(hash); const dataNode = output.querySelector(".data"); dataNode.innerHTML = "" + rects.map(function(rect){ return ""; }).join("") + "" + rects.map(function(rect){ return ""; }).join("") + "" + properties.map(function(property){ return "" + rects.map(function(rect){ return ""; }).join("") + ""; }).join("") + "
" + rect.name + "
hash
" + property + "" + formatNumber(rect.data[property]) + "
"; rects.forEach(async function(rect){ const data = new Float64Array(properties.length); properties.forEach(function(property, i){ data[i] = rect.data[property]; }); const hash = await crypto.subtle.digest("SHA-256", data); dataNode.querySelector( ".rectHash[data-name=\"" + rect.name + "\"]" ).textContent = byteArrayToHex(hash); }); } function createTest(title, callback){ const output = template.cloneNode(true); output.querySelector(".title").textContent = title; output.querySelector(".refresh").addEventListener("click", function(){ performTest(output, callback); }); output.querySelector(".performance").addEventListener("click", function(){ let count = 200; let totalCount = 0; let totalDuration = 0; return function(){ let duration = 0; let i = 0; while (duration < 1000){ const start = Date.now(); for (; i < count; i += 1){ const rects = getElements().map(function(element){ return { name: element.dataset.name, data: callback(element) }; }); const data = new Float64Array(rects.length * properties.length); rects.forEach(function(rect, i){ properties.forEach(function(property, j){ data[i * properties.length + j] = rect.data[property]; }); }); } duration += Date.now() - start; if (duration < 1000){ count += Math.ceil( count * (1000 - duration) / 1000 ); } } totalCount += count; totalDuration += duration; alert( (totalCount / (totalDuration / 1000)).toFixed(2) + " tests/s\n" + (totalDuration * 1000 / totalCount).toFixed(2) + " µs/test\n" + "(" + totalCount + " samples)" ); }; }()); container.appendChild(output); performTest(output, callback); } iframe.addEventListener("load", function(){ createTest("Element.getClientRects", function(element){ return element.getClientRects()[0]; }); createTest("Element.getBoundingClientRect", function(element){ return element.getBoundingClientRect(); }); createTest("Range.getClientRects", function(element){ const range = document.createRange(); range.selectNode(element); return range.getClientRects()[0]; }); createTest("Range.getBoundingClientRect", function(element){ const range = document.createRange(); range.selectNode(element); return range.getBoundingClientRect(); }); }); }());