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Tools to selectively Copy HTML+CSS+JS From A Specific Element of DOM [closed]

Like most web developers, I occasionally like to look at the source of websites to see how their markup is built. Tools like Firebug and Chrome Developer Tools make it easy to inspect the code, but if I want to copy a specific section and play around with it locally, it would be a pain to copy all the individual elements and their associated CSS. And probably just as much work to save the entire source and cut out the unrelated code.

It would be great if I could right-click a Element in Firebug and have a "Save HTML+CSS+JS for this Element" option. Does such a tool exist? Is it possible to extend Firebug or Chrome Developer Tools to add this feature?

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kenwarner Avatar asked Feb 06 '11 03:02

kenwarner


People also ask

How do I copy HTML and CSS code from any website?

Chrome: Right-click a blank space on the page and choose View Page Source. Highlight the code, then copy and paste to a text file. Firefox: From the menu bar, choose Tools > Web Developer > Page Source. Highlight the code, then copy and paste to a text file.

How do I copy an element using CSS?

First, hover over the element you want to copy. Then, right-click on it and choose the option “Inspect”. On the left side is the HTML DOM tree, and on the right side, the CSS styles of the selected element. Having the right element selected on the HTML DOM tree, right-click on it and choose “Copy” > “Copy styles”.

How do I eXtract HTML from a website?

View Source Using View Page Source Fire up Chrome and jump to the webpage you want to view the HTML source code. Right-click the page and click on “View Page Source,” or press Ctrl + U, to see the page's source in a new tab. A new tab opens along with all the HTML for the webpage, completely expanded and unformatted.


4 Answers

SnappySnippet

I finally found some time to create this tool. You can install SnappySnippet from Github. It allows easy HTML+CSS extraction from the specified (last inspected) DOM node. Additionally, you can send your code straight to CodePen or JSFiddle. Enjoy!

SnappySnippet Chrome extension

Other features

  • cleans up HTML (removing unnecessary attributes, fixing indentation)
  • optimizes CSS to make it readable
  • fully configurable (all filters can be turned off)
  • works with ::before and ::after pseudo-elements
  • nice UI thanks to Bootstrap & Flat-UI projects

Code

SnappySnippet is open source, and you can find the code on GitHub.

Implementation

Since I've learned quite a lot while making this, I've decided to share some of the problems I've experienced and my solutions to them, maybe someone will find it interesting.

First attempt - getMatchedCSSRules()

At first I've tried retrieving the original CSS rules (coming from CSS files on the website). Quite amazingly, this is very simple thanks to window.getMatchedCSSRules(), however, it didn't work out well. The problem was that we were taking only a part of the HTML and CSS selectors that were matching in the context of the whole document, which were not matching anymore in the context of an HTML snippet. Since parsing and modifying selectors didn't seem like a good idea, I gave up on this attempt.

Second attempt - getComputedStyle()

Then, I've started from something that @CollectiveCognition suggested - getComputedStyle(). However, I really wanted to separate CSS form HTML instead of inlining all styles.

Problem 1 - separating CSS from HTML

The solution here wasn't very beautiful but quite straightforward. I've assigned IDs to all nodes in the selected subtree and used that ID to create appropriate CSS rules.

Problem 2 - removing properties with default values

Assigning IDs to the nodes worked out nicely, however I found out that each of my CSS rules has ~300 properties making the whole CSS unreadable.
Turns out that getComputedStyle() returns all possible CSS properties and values calculated for the given element. Some of them where empty, some had browser default values. To remove default values I had to get them from the browser first (and each tag has different default values). The solution was to compare the styles of the element coming from the website with the same element inserted into an empty <iframe>. The logic here was that there are no style sheets in an empty <iframe>, so each element I've appended there had only default browser styles. This way I was able to get rid of most of the properties that were insignificant.

Problem 3 - keeping only shorthand properties

Next thing I have spotted was that properties having shorthand equivalent were unnecessarily printed out (e.g. there was border: solid black 1px and then border-color: black;, border-width: 1px itd.).
To solve this I've simply created a list of properties that have shorthand equivalents and filtered them out from the results.

Problem 4 - removing prefixed properties

The number of properties in each rule was significantly lower after the previous operation, but I've found that I sill had a lot of -webkit- prefixed properties that I've never hear of (-webkit-app-region? -webkit-text-emphasis-position?).
I was wondering if I should keep any of these properties because some of them seemed useful (-webkit-transform-origin, -webkit-perspective-origin etc.). I haven't figured out how to verify this, though, and since I knew that most of the time these properties are just garbage, I decided to remove them all.

Problem 5 - combining same CSS rules

The next problem I have spotted was that the same CSS rules are repeated over and over (e.g. for each <li> with the exact same styles there was the same rule in the CSS output created).
This was just a matter of comparing rules with each other and combining these that had exactly the same set of properties and values. As a result, instead of #LI_1{...}, #LI_2{...} I got #LI_1, #LI_2 {...}.

Problem 6 - cleaning up and fixing indentation of HTML

Since I was happy with the result, I moved to HTML. It looked like a mess, mostly because the outerHTML property keeps it formatted exactly as it was returned from the server.
The only thing HTML code taken from outerHTML needed was a simple code reformatting. Since it's something available in every IDE, I was sure that there is a JavaScript library that does exactly that. And it turns out that I was right (jquery-clean). What's more, I've got unnecessary attributes removal extra (style, data-ng-repeat etc.).

Problem 7 - filters breaking CSS

Since there is a chance that in some circumstances filters mentioned above may break CSS in the snippet, I've made all of them optional. You can disable them from the Settings menu.

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Konrad Dzwinel Avatar answered Oct 07 '22 21:10

Konrad Dzwinel


I originally asked this question I was looking for a Chrome (or FireFox) solution, but I stumbled across this feature in Internet Explorer developer tools. Pretty much what I'm looking for (except for the javascript)

Element Source with Style

Result:

Element Source with Style result

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kenwarner Avatar answered Oct 07 '22 22:10

kenwarner


Webkit browsers (not sure about FireBug) allow you to copy the HTML of an element easily, so that's one part of the process out of the way.

Running this (in the javascript console) prior to copying the HTML for an element will move all the computed styles for the parent element given, as well as all child elements, into the inline style attribute which will then be available as part of the HTML.

var el = document.querySelector("#someid");
var els = el.getElementsByTagName("*");

for(var i = -1, l = els.length; ++i < l;){

    els[i].setAttribute("style", window.getComputedStyle(els[i]).cssText);

}

It's a total hack and you'll have alot of "junk" css attributes to wade through, but should at least get your started.

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Collective Cognition Avatar answered Oct 07 '22 20:10

Collective Cognition


I've created this tool years ago for the same purpose:
http://www.betterprogramming.com/htmlclipper.html

You're welcome to use and improve upon it.

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Florentin Avatar answered Oct 07 '22 20:10

Florentin