How Do You Selectively Copy HTML, CSS, and JS from a Specific DOM Element?

Tools to Selectively Copy HTML CSS JS from a Specific Element of DOM

Inspecting web page source is a common practice for web developers, but copying specific sections for local tinkering can be cumbersome. This article explores tools and techniques to selectively copy HTML CSS JS from a desired element in the DOM.

SnappySnippet: A Custom Solution

The author of this article created SnappySnippet, a Chrome extension that provides the functionality to extract HTML CSS JS from the last inspected DOM node. This tool offers additional features such as CSS optimization, code cleanup, and direct code sharing to CodePen and JSFiddle.

Other Features

SnappySnippet includes the following capabilities:

• HTML cleanup and indentation
• CSS optimization for readability
• Customization and filtering options
• Handling of pseudo-elements (::before, ::after)
• Intuitive user interface

Implementation Details

The implementation of SnappySnippet involved several challenges and solutions:

Problem 1: Separating CSS from HTML

To isolate CSS, the author assigned IDs to nodes in the selected subtree and used those IDs to create corresponding CSS rules.

Problem 2: Removing Default Values

The use of getComputedStyle() resulted in a large number of empty or default-valued CSS properties. To address this, the author compared element styles in a website context with those in an empty iframe, where default browser styles are applied.

Problem 3: Keeping Only Shorthand Properties

Shorthand properties (e.g., border-color) were duplicated in the output. The author filtered these out using a list of properties with shorthand equivalents.

Problem 4: Removing Prefixed Properties

Prefixed properties (e.g., -webkit-transform-origin) were considered unnecessary for general use. The author removed them all for simplicity.

Problem 5: Combining Same CSS Rules

Multiple CSS rules with identical properties and values were present in the output. Combining these rules significantly reduced their number.

Problem 6: Cleaning Up HTML

The outerHTML property returned unformatted HTML content. The author incorporated a JavaScript library (jquery-clean) for code reformatting and unnecessary attribute removal.

Problem 7: Filters Breaking CSS

Optional filters were added to SnappySnippet to prevent CSS breakage. Users can disable these filters in the Settings menu.

The code for SnappySnippet is publicly available on GitHub for further exploration and customization.

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