[HTML4 specification][1] states that:

&gt; Inline elements may contain only data and other inline elements

Span is an inline element, therefore having span inside span is valid.
There&#39;s a related question: [Can &amp;lt;span&amp;gt; tags have any type of tags inside them?][2] which makes it completely clear.

[HTML5 specification][3] (including the most current draft of [HTML 5.3][4] dated November 16, 2017) changes terminology, but it&#39;s still perfectly valid to place span inside another span.


  [1]: http://www.w3.org/TR/html401/struct/global.html#h-7.5.3
  [2]: https://stackoverflow.com/questions/5545884/can-span-tags-have-any-type-of-tags-inside-them
  [3]: http://www.w3.org/TR/html5/text-level-semantics.html#the-span-element
  [4]: https://w3c.github.io/html/textlevel-semantics.html#the-span-element

Yes. You can have a `span` within a `span`. Your problem stems from something else.

Is it possible to generate an automatic Table of Contents using [Github Flavoured Markdown][1]?

  [1]: http://github.github.com/github-flavored-markdown/

Automatic TOC in github-flavoured-markdown

This is a really basic question really just to satisfy my curiosity, but is there a way to do something like this:

    if(obj !instanceof Array) {
        //The object is not an instance of Array
    } else {
        //The object is an instance of Array
    }

The key here being able to use the NOT ! in front of instance. Usually the way I have to set this up is like this:

    if(obj instanceof Array) {
        //Do nothing here
    } else {
        //The object is not an instance of Array
        //Perform actions!
    }

And its a little annoying to have to create an else statement when I simply want to know if the object is a specific type.

Javascript !instanceof If Statement

Here is the story: I&#39;m using SWFObject to insert a Flash object into my page. The embedding eats my `span`. So, I lose all my CSS for it. I was thinking of moving all of the CSS to the parent so I don&#39;t lose my CSS styles when the Flash appears. 

I have tried using a `span` within a `span`, but I don&#39;t think it&#39;s working. Is there a reason for this? I don&#39;t understand why you could have `div` within a `div` but not a `span` within a `span`.

Does it have to do with `spans` being inline?

Can you have a &lt;span&gt; within a &lt;span&gt;?

Here is the story: I'm using SWFObject to insert a Flash object into my page. The embedding eats my <code>span</code>. So, I lose all my CSS for it. I was thinking of moving all of the CSS to the parent so I don't lose my CSS styles when the Flash appears.
I have tried using a <code>span</code> within a <code>span</code>, but I don't think it's working. Is there a reason for this? I don't understand why you could have <code>div</code> within a <code>div</code> but not a <code>span</code> within a <code>span</code>.
Does it have to do with <code>spans</code> being inline?

How to do this through the tag itself
change type from text to password

    &lt;input type=&#39;text&#39; name=&#39;pass&#39;  /&gt;

Is it possible to insert JS inside the input tag itself to change type=&#39;text&#39; to type=&#39;password&#39;?

change html input type by JS?

I have to include some images (company logo&#39;s etc) in email signatures. I&#39;ve had all sorts of issues using the embedded images produced by the email system in question (they get sent as attachments generally) and as linked images (requiring permission to display them in the email received).

I have just seen some email from exchange that has a base64 image representation of the logo and uses a &lt;src=&quot;cid:image001.gif&quot;&gt; tag to do the displaying. I&#39;m looking for some information on how I could do this in an email signature if possible (how do I generate the base64 version of the logo for a start and what code do I need to get it to work)?

I&#39;ve tried simple things such as 

    &lt;body&gt;
    &lt;span&gt;
    &lt;img src=.... &gt;
    &lt;/span&gt;
    &lt;/body&gt;

but all I get is the alt text so I&#39;m obviously doing something wrong here.

base64 encoded images in email signatures

I would like to write a CSS selector rule that selects all elements that _don&#39;t_ have a certain class. For example, given the following HTML:

    &lt;html class=&quot;printable&quot;&gt;
        &lt;body class=&quot;printable&quot;&gt;
            &lt;h1 class=&quot;printable&quot;&gt;Example&lt;/h1&gt;
            &lt;nav&gt;
                &lt;!-- Some menu links... --&gt;
            &lt;/nav&gt;
            &lt;a href=&quot;javascript:void(0)&quot; onclick=&quot;javascript:self.print()&quot;&gt;Print me!&lt;/a&gt;
            &lt;p class=&quot;printable&quot;&gt;
                This page is super interresting and you should print it!
            &lt;/p&gt;
        &lt;/body&gt;
    &lt;/html&gt;

I would like to write a selector that selects all elements that don&#39;t have the &quot;printable&quot; class which, in this case, are the _nav_ and _a_ elements.

Is this possible?

NOTE: in the actual HTML where I would like to use this, there are going to be a lot more elements that _don&#39;t_ have the &quot;printable&quot; class than do (I realize it&#39;s the other way around in the above example).

Can I write a CSS selector selecting elements NOT having a certain class or attribute?

When I&#39;m adding a div to body, it&#39;s returning the body as the object and then whenever I use that - it&#39;s obviously using body. Bad.

Code:-

    var holdyDiv = $(&#39;body&#39;).append(&#39;div&#39;);
    $(holdyDiv).attr(&#39;id&#39;, &#39;holdy&#39;);

The &#39;id&#39; of holdy is now being added to body... eh? What am I doing wrong.

jQuery - Appending a div to body, the body is the object?

I&#39;ve built an image slider (based on the terrific [bxSlider][1]) which will preload images just-in-time before they slide into view. It&#39;s working pretty well already, but I don&#39;t think my solution is valid HTML.

My technique is as follows: I generate the slider markup with the first slide image being inserted as usual (with an `&lt;img src=&quot;foo.jpg&quot;&gt;`) and subsequent images being referenced in a data attribute like `&lt;img data-orig=&quot;bar.jpg&quot;&gt;`.  A Javascript then juggles the `data-orig -&gt; src` change when necessary, triggering the preloading.

In other words, I have:

	&lt;div class=&quot;slider&quot;&gt;
		&lt;div&gt;&lt;img src=&quot;time.jpg&quot; /&gt;&lt;/div&gt; 
		&lt;div&gt;&lt;img src=&quot;data:&quot; data-orig=&quot;fastelavn.jpg&quot; /&gt;&lt;/div&gt; 
		&lt;div&gt;&lt;img src=&quot;data:&quot; data-orig=&quot;pels_strik.jpg&quot; /&gt;&lt;/div&gt; 
		&lt;div&gt;&lt;img src=&quot;data:&quot; data-orig=&quot;fashion.jpg&quot; /&gt;&lt;/div&gt; 
	&lt;/div&gt;

To avoid empty `src=&quot;&quot;` attributes (which are [harmful to performance][2] in [some browsers][3]), I&#39;ve inserted `src=&quot;data:&quot;` to effectively insert a blank image as a placeholder.

The thing is, I can&#39;t seem to find anything in the [documentation for data-URI][4] saying whether this is a valid data-URI or not. I basically want the minimal data-URI that resolves to a blank/transparent image, so the browser can resolve the src immediately and move on (with no error or network request). Maybe `src=&quot;data:image/gif;base64,&quot;` would be better?



  [1]: http://bxslider.com/
  [2]: http://www.nczonline.net/blog/2009/11/30/empty-image-src-can-destroy-your-site/
  [3]: http://www.nczonline.net/blog/2010/07/13/empty-string-urls-browser-update/
  [4]: http://www.faqs.org/rfcs/rfc2397.html

Blank image encoded as data-uri

I want to be able to draw a border OUTSIDE of my Div! So if my div is say 20px by 20px, I want a 1px border outside of this (so in essence, I get a div 22x22px large). 

I understand that I can just make the div 22x22 to start with, but for reasons I have, I need the borders to be on the outside.

CSS outline works, but I want only border-bottom or border-top thingy, so something like outline-bottom, which does not work, is what I want.

Is there a way to do this?

Thanks

CSS Outside Border

Imagine I have the following CSS

    font-family: &#39;Non-existant Sans&#39;, Arial, sans-serif;

Assuming &#39;Non-existant Sans&#39; is not installed on the system, Arial will be used by the browser. Using Chrome, is there any way of finding out which font is being rendered?

**Edit:** Dave (in the comments to the question) has pointed out a similar question. I&#39;m specifically asking about Chrome here. Many of the answers in the other question suggest extensions which are okay, however; is there a native way of determining this information using the Dev Tools alone?

**Edit Sept 2013:** The Chrome team have just announced that font-family inspection is now available in the [latest builds of Chrome Canary][1] (Twitter link contains an image with more info). This should trickle down through dev &gt; beta &gt; stable over the next few weeks – great news!

[1]: https://twitter.com/chromiumdev/status/384098351353839616

How do I tell which font Chrome is using?

So, I have an `app/assets/stylesheets/` directory structure that looks something like this:

       |-dialogs
       |-mixins
       |---buttons
       |---gradients
       |---vendor_support
       |---widgets
       |-pages
       |-structure
       |-ui_elements

In each directory, there are multiple sass partials (usually *.css.scss, but one or two *.css.scss.erb).

I might be assuming a lot, but rails SHOULD automatically compile all the files in those directories because of `*= require_tree .` in application.css, right?

I recently have tried restructuring these files by removing all color variables and placing them in a file in the root `app/assets/stylesheets` folder (_colors.css.scss). I then created a file in the root `app/assets/stylesheets` folder called master.css.scss which looks like this:

    // Color Palette 
    @import &quot;colors&quot;;
    
    // Mixins
    @import &quot;mixins/buttons/standard_button&quot;;
    @import &quot;mixins/gradients/table_header_fade&quot;;
    @import &quot;mixins/vendor_support/rounded_corners&quot;;
    @import &quot;mixins/vendor_support/rounded_corners_top&quot;;
    @import &quot;mixins/vendor_support/box_shadow&quot;;
    @import &quot;mixins/vendor_support/opacity&quot;;

I don&#39;t really understand how rails handles the order of asset compilation, but it&#39;s obviously not in my favor. It appears none of the files realize they have any variables or mixins being imported, and so it throws errors and I can&#39;t compile. 

    Undefined variable: &quot;$dialog_divider_color&quot;.
      (in /home/blah/app/assets/stylesheets/dialogs/dialog.css.scss.erb)

    Undefined mixin &#39;rounded_corners&#39;.
      (in /home/blah/app/assets/stylesheets/widgets.css.scss)

The variable `$dialog_divider_color` is clearly defined in _colors.css.scss, and `_master.css.scss` is importing colors and all my mixins. But apparently rails didn&#39;t get that memo.

Is there some way I can fix these errors, or will I need to resort to putting all my variable definitions back into each individual file, as well as all the mixin imports?

Unfortunately, [this guy][1] doesn&#39;t seem to think it&#39;s possible, but I&#39;m hoping he&#39;s wrong. Any thoughts are greatly appreciated.


  [1]: https://stackoverflow.com/questions/8887824/persisting-scss-variables-in-rails-asset-pipeline

Proper SCSS Asset Structure in Rails

I am writing a quiz in `html` and I would like to insert a consistent blank vertical space between questions (like one would use `vspace{3 cm}` in LaTeX).  

For example:

    &lt;html&gt;
      &lt;body&gt;
        &lt;p&gt;
         This is the first question?
          &lt;!-- this is where I want about 3 cm of space --&gt;
        &lt;/p&gt;
        &lt;p&gt; 
         This is the second question?
         &lt;!-- this is where I want about 3 cm of space --&gt;
        &lt;/p&gt;
      &lt;/body&gt;
    &lt;/html&gt;

Is there a straight forward way of doing this using just `html` and `css`?

Content Type	Original Author	Original Content on Stackoverflow
Question	Roozbeh15	View Question on Stackoverflow
Solution 1 - Html	Paweł Bulwan	View Answer on Stackoverflow
Solution 2 - Html	bookcasey	View Answer on Stackoverflow

Can you have a <span> within a <span>?

Html Problem Overview

Html Solutions

Solution 1 - Html

Solution 2 - Html

Javascript !instanceof If Statement

Automatic TOC in github-flavoured-markdown

Attributions