Practical Steps:
- Use getElementById over querySelector: getElementById is faster as it uses an optimized lookup.
- Use textContent or innerText: Prefer these over innerHTML to improve performance and security.
- Avoid unnecessary DOM manipulations: Cache DOM elements and update them only when necessary.
- Minimize flows and repairs: Avoid frequently updating the DOM, use requestAnimationFrame or MutationObserver.
Example:
// Efficient DOM manipulation
const div = document.getElementById("my-div");
div.textContent = "Updated content";
// Slow and inefficient
document.querySelector("div").innerHTML = "Slow and inefficient content";
Guidelines for Accessibility and Ease of Use:
- Ensure elements have appropriate semantic markup (e.g., headings, paragraphs).
- Add clear labels and captions to form elements.
- Use high-contrast colors and accessible fonts.
- Provide keyboard navigation and screen reader support.