Apply OP CSS classes to all the ckEditor elements with semantic value (p, hx, blockquote...) during the edition (editing view). All element types would have always the same custom class (all p would always have .op-paragraph…).

\* With table we might need to be able to target both <table> as well as <tr> and probably even <td>.

Targeted elements: <p>, <h1>, <h2>, <h3>, <h4>, <h5>, <h6>, <ul>, <ol>, <li>, <a>, <img>, <table>, <td> (more important than tr), <tr>, <blockquote>, <code>, <code-block>, <figure>, first child of the figure should have its own class, container (document-editor\_\_editable-container).

###

TODO:

**FrontEnd:**

* [x] <p> (.op-uc-p)
* [x] <h1> (.op-uc-h1)
* [x] <h2> (.op-uc-h2)
* [x] <h3> (.op-uc-h3)
* [x] <h4> (.op-uc-h4)
* [x] <h5> (.op-uc-h5)
* [x] <h6> (.op-uc-h6)
* [ ] <a> (.op-uc-link)
* [x] <li> (.op-uc-list--item)
* [x] <blockquote> (.op-uc-blockquote)
* [ ] <code-block> (.op-uc-code-block)
* [ ] ~~<macro class=".-toc"> (.op-uc-toc, .op-uc-toc--list, .op-uc-toc--list-item)~~
* [ ] <code> (.op-uc-code)
* [ ] <img> Begin of the insertion(.op-uc-image and op-uc-figure--content)End of the insertion Begin of the deletion (.op-uc-image)End of the deletion
* [ ] <table> Begin of the insertion(.op-uc-table and op-uc-figure--content)End of the insertion Begin of the deletion (.op-uc-table)End of the deletion
* [ ] <td> (.op-uc-table--cell)
* [ ] <tr> (.op-uc-table--row)
* [ ] <ul> (.op-uc-list)
* [ ] <ol>  (.op-uc-list)
* [ ] <figure> (.op-uc-figure, .op-uc-figure--content, .op-uc-figure--description)
* [ ] The container element (.op-uc-container)
* [ ] <macro>
* [ ] Apply op-uc-placeholder to all the macros.
* [ ] Remove other custom classes applied.

**BackEnd:**

* [x] <p> (.op-uc-p)
* [x] <h1> (.op-uc-h1)
* [x] <h2> (.op-uc-h2)
* [x] <h3> (.op-uc-h3)
* [x] <h4> (.op-uc-h4)
* [x] <h5> (.op-uc-h5)
* [x] <h6> (.op-uc-h6)
* [ ] <a> (.op-uc-link)
* [x] <li> (.op-uc-list--item)
* [x] <blockquote> (.op-uc-blockquote)
* [x] <code-block> (.op-uc-code-block)
* [x] <macro class=".-toc"> (.op-uc-toc, .op-uc-toc--list, .op-uc-toc--list-item)
* [x] <code> (.op-uc-code)
* [ ] <img> Begin of the insertion(.op-uc-image and op-uc-figure--content)End of the insertion Begin of the deletion (.op-uc-image)End of the deletion
* [ ] <table> Begin of the insertion(.op-uc-table and op-uc-figure--content)End of the insertion Begin of the deletion (.op-uc-table)End of the deletion
* [ ] <td> (.op-uc-table--cell)
* [ ] <tr> (.op-uc-table--row)
* [x] <ul> (.op-uc-list)
* [x] <ol>  (.op-uc-list)
* [ ] <figure> (.op-uc-figure, .op-uc-figure--content, .op-uc-figure--description)
* [ ] The container element (.op-uc-container)

**NOTES:**

* How to create modifier classes for figures `.op-uc-figure_align-center` `&_align-start` `&_align-end`?
* Build latest to branch Branch fix/update-wysiwyg-styles
* .op-uc-container
  .op-uc-h1
  .op-uc-p
  .op-uc-blockquote
    .op-uc-xxx
  .op-uc-figure
    .op-uc-figure--content (&.op-uc-table)
    .op-uc-figure--description
* https://ckeditor.com/docs/ckeditor5/latest/framework/guides/deep-dive/conversion/conversion-extending-output.html#adding-a-css-class-to-block-elements
* https://ckeditor.com/docs/ckeditor5/latest/framework/guides/deep-dive/conversion/conversion-extending-output.html