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Q&A How to control how HTML is copied into the clipboard in plain text form?

Premise The text/plain representation of my HTML5 markup is inequivalent to its CSS3 markup, even in manners which /plain is able to represent, like the amount of line breaks and depth (or even pr...

2 answers  ·  posted 1y ago by Mr. Beedell, Roke Julian Lockhart (RJLB)‭  ·  edited 1y ago by Mr. Beedell, Roke Julian Lockhart (RJLB)‭

Question javascript html web css
#5: Post edited by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2025-09-16T10:03:05Z (about 1 year ago)
  • #### Premise
  • When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • #### Demonstration
  • An example is how, in `firefox-142.0`, `firefox 'data:text/html;charset=utf-8,<!DOCTYPE html><html><body><p>Unindented</p><blockquote>Indented</blockquote></body></html>'` becomes:
  • ~~~txt
  • Unindented
  • Indented
  • ~~~
  • #### Rationale
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to `<h[1-6]>` (with ECMAScript). However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • #### Desire
  • Can this be achieved? If so, how?
  • #### Premise
  • The `text/plain` representation of my HTML5 markup is inequivalent to its CSS3 markup, even in manners which `/plain` is able to represent, like the amount of line breaks and depth (or even presence of) indentation. Specifically:
  • 1. When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it.
  • 1. Similarly, `<p>`s retain a single line between them even when it is not rendered.
  • 1. Likewise, margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • For this question, I care about the indentation. However, if someone is competent enough to generalise to the other problems, I'll be glad for the effort.
  • #### Demonstration
  • An example is how, in `firefox-142.0`, `firefox 'data:text/html;charset=utf-8,<!DOCTYPE html><html><body><p>Unindented</p><blockquote>Indented</blockquote></body></html>'` becomes:
  • ~~~txt
  • Unindented
  • Indented
  • ~~~
  • #### Rationale
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to `<h[1-6]>` (with ECMAScript). However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • #### Desire
  • Can this be achieved? If so, how?
#4: Post edited by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2025-09-16T09:46:22Z (about 1 year ago)
  • #### Premise
  • When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • #### Demonstration
  • An example is how, in `firefox-142.0`, `firefox 'data:text/html;charset=utf-8,<!DOCTYPE html><html><body><p>Unindented</p><blockquote>Indented</blockquote></body></html>'` becomes:
  • ~~~txt
  • Unindented
  • Indented
  • ~~~
  • #### Rationale
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to the text with ECMAScript. However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • #### Desire
  • Can this be achieved? If so, how?
  • #### Premise
  • When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • #### Demonstration
  • An example is how, in `firefox-142.0`, `firefox 'data:text/html;charset=utf-8,<!DOCTYPE html><html><body><p>Unindented</p><blockquote>Indented</blockquote></body></html>'` becomes:
  • ~~~txt
  • Unindented
  • Indented
  • ~~~
  • #### Rationale
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to `<h[1-6]>` (with ECMAScript). However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • #### Desire
  • Can this be achieved? If so, how?
#3: Post edited by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2025-08-24T21:32:54Z (about 1 year ago)
Provided an example.
  • When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to the text with ECMAScript. However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • Can this be achieved? If so, how?
  • #### Premise
  • When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.
  • #### Demonstration
  • An example is how, in `firefox-142.0`, `firefox 'data:text/html;charset=utf-8,<!DOCTYPE html><html><body><p>Unindented</p><blockquote>Indented</blockquote></body></html>'` becomes:
  • ~~~txt
  • Unindented
  • Indented
  • ~~~
  • #### Rationale
  • I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to the text with ECMAScript. However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.
  • [1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060
  • #### Desire
  • Can this be achieved? If so, how?
#2: Post edited by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2025-08-23T22:09:58Z (about 1 year ago)
  • How to control how text is copied into the clipboard in plain text form?
  • How to control how HTML is copied into the clipboard in plain text form?
#1: Initial revision by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2025-08-23T22:06:11Z (about 1 year ago)
How to control how text is copied into the clipboard in plain text form?
When I duplicate the content of a `<blockquote>`, it is indented with a tabulator, even though my linked CSS3 stylesheet does not indent it. Similarly, `<p>`s retain a single line between them even when it is not rendered, and margins that would produce a line between non-`<p>` text lack line breaks between them, rendering them nigh unreadable.

I would like my webpage to be as readable as is possible when duplicated into plain text form with <kbd>Control</kbd>. To this end, I've appended colons to the text with ECMAScript. However, I utilise indentation extensively to indicate nested sections. Until [the WHATWG implements an `<indent>` element][1], which would presumably be indented as `<blockquote>` is on paste, I need to manually implement this.

[1]: https://github.com/whatwg/html/issues/8751#issuecomment-2676253060

Can this be achieved? If so, how?