How to detect if an in memory DOM element is a block element?

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I have some HTML as a string and i need to wrap all inline elements inside a p tag, without actually rendering them.


<h2>Some heading</h2>
<p>Some content</p>
<strong>Some inline content</strong>

should be converted to

<h2>Some heading</h2>
<p>Some content</p>
<p><strong>Some inline content</strong></p>

I am processing the html by creating an in memory DOM.

function ensureRootLevelBlockTags(html) {
    const psuedoDom = document.createElement('div');
    psuedoDom.innerHTML = html;

    const childNodes = psuedoDom.childNodes;
    for (let i = 0; i < childNodes.length; i++) {
        const currentNode = childNodes[i];
        if (/* is currentNode is not a block element */) {
            const newNode = document.createElement('p');
            psuedoDom.insertBefore(newNode, childNodes[i]);

    return psuedoDom.innerHTML;

ensureRootLevelBlockTags('<h2>Some heading</h2><p>Some content</p><strong>Some inline content</strong>');

I need the condition I can use to check if the element is a block element.


We were already using tinymce in the project, and found that tinymce.html.Schema object contains a list of valid tags and their valid children. I ended up using that as reference to check if i can wrap the element inside p.

JavaScript Programmer's Reference, There are some caveats when it comes to deleting elements from the DOM, however. Check if outerHTML is available and, if so, use it to clear the memory in IE. to an element for a specific event; an event handler is essentially a block of  Detached Dom elements. Detached DOM elements are the elements which have been removed from the DOM but their memory is still retained because of JavaScript. This means that as long the element have a reference to any variable or an object anywhere, it does not garbage collected even after destroyed from the DOM.

How JavaScript works: tracking changes in the DOM using , In the process of identifying and describing the core elements, we Memory management + how to handle 4 common memory leaks The building blocks of Web Workers + 5 cases when you should use MutationObserver is a Web API provided by modern browsers for detecting changes in the DOM. If you look at the W3C, there is actually an event that gets triggered when a DOM element is removed from a document sub-tree: DOMNodeRemoved: Fires when a node has been removed from a DOM-tree. This DOM event will bubble up the document tree with the removed node as its target.

Try using the element. the results will either be block, inline, none, or inline-block.

Formal Methods: An Appetizer, corresponding to the node qs consists of a single frame recording that the the outer block and after the declaration of y we have the memory labelled (q). o for an element of Frame and 3 for an element of Meme, that is, a stack of frames; U dom(3') if a = o ::G' {} otherwise One of the key operations on the memory is to  If the DOM element holds a large amount of data (illustrated in the above example with the "lotsOfData" property), the memory consumed by this data will never be released and can lead to memory related issues such as the browser becoming increasingly slower.

Memory Management, In contrast, JavaScript automatically allocates memory when objects are created and createElement('div'); // allocates a DOM element to monitor memory allocation and determine when a block of allocated memory is no  Checking for support for the audio and video elements of HTML 5. Next up, you can also use document.createElement() to check for support for the new audio and video elements of HTML 5. Both elements once defined support a list of methods, one of which is play(). By fishing for this method in the newly created object, we can check whether the

High Performance Mobile Web: Best Practices for Optimizing Mobile , For now, suffice it to say that if you have many images in your site (preferred logos, use a CSS mask to determine which portion of it to show in each container. Rather than <img>elements, you will instead use any block element (<div>) or on rendering performance, because the big image will be duplicated in memory  Memory Elements • Combinational logic cannot remember Output logic values are function of inputs only Feedback is needed to be able to remember a logic value • Memory elements are needed in most digital logic circuits to hold (remember) logic values • 2 basic types of memory elements Latches • Level-sensitive to inputs Flip-flops

The 10 Most Common Mistakes JavaScript Developers Make, Common Mistake #2: Thinking there is block-level scope Memory leaks are almost inevitable JavaScript problems if you're not consciously coding to avoid them. Interestingly, even if element is removed from the DOM, the circular self-​reference above would prevent element to determine whether a value is NaN or not. You can also Find (Ctrl+F) an element in the HTML tree view by searching for its tag name, attributes, or text content. Editing elements. You can edit an element by right-clicking on it within the HTML tree view and selecting Edit as HTML from the context menu.