Last week, I wrote about how you can use CSS selectors to help lint your HTML. The general idea behind this concept was that we can use some of the more advanced CSS selectors, such as :not(), to select certain types of elements in the document. For example, we can...

When HTML is written incorrectly, nothing much happens. Because of this, it's easy to have invalid, unsemantic, or unaccessible bits in markup without it being obvious. There are many ways we can lint our HTML to discover and fix these issues, for example using the W3C Markup Validation Service. Another...

In my article on Understanding the Critical Rendering Path, I wrote about the effect JavaScript files have on the Critical Rendering Path. JavaScript is considered a "parser blocking resource". This means that the parsing of the HTML document itself is blocked by JavaScript. When the parser reaches a <script&...

The typeof operator in JavaScript evaluates and returns a string with the data type of an operand. For example, to find the type of 123, we would write - typeof 123 This will return a string with the type of 123, which, in this case, will be "number". In addition...

Like a lot of people, I like GIFs. I like to use them in my articles to illustrate functionality. For example, this GIF from my article on "Recreating the iTunes Library" - However, a problem with this is that GIFs are heavy, the one above is a whopping 11.4...