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Most themes use the <a href="https://codex.wordpress.org/Theme_Customization_API" rel="ugc">https://codex.wordpress.or<wbr />g/Theme_Cu<wbr />stomizatio<wbr />n_API</a> which allows for many customizations.<br />
<br />
Also for commonly used themes - TwentySeventeen, GeneratePress, etc - you'll likely find many plugins which tend to bundle up many changes into... say skins for themes...<br />
<br />
You also go one step more + use <a href="https://wordpress.org/plugins/elementor/" rel="ugc">Elementor</a> with <a href="https://wordpress.org/plugins/fullwidth-templates/" rel="ugc">FullWidth Templates</a>, so Elementor takes over the entire rendering process.
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Most themes use the https://codex.wordpress.org/Theme_Customization_API [https://codex.wordpress.org/Theme_Customization_API] which allows for many customizations.

Also for commonly used themes - TwentySeventeen, GeneratePress, etc - you'll likely find many plugins which tend to bundle up many changes into... say skins for themes...

You also go one step more + use Elementor [https://wordpress.org/plugins/elementor/] with FullWidth Templates [https://wordpress.org/plugins/fullwidth-templates/], so Elementor takes over the entire rendering process.

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I use TinyMCE Advanced<br />
<a href="https://wordpress.org/plugins/tinymce-advanced/" rel="ugc">https://wordpress.org/plugins/tinymce-advanced/</a>
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I use TinyMCE Advanced
https://wordpress.org/plugins/tinymce-advanced/ [https://wordpress.org/plugins/tinymce-advanced/]

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The TimyMCE Advanced is better, but one thing that my client cannot do is leave a &nbsp;blank line between paragraphs. He presses enter twice, but when publishing it ignores the extra line.
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The TimyMCE Advanced is better, but one thing that my client cannot do is leave a  blank line between paragraphs. He presses enter twice, but when publishing it ignores the extra line.

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<div class="content wysiwyg-content">
Hi Experts,<br />
<br />
Is there WP plugin that would give backend users more RTF options for posts and pages like font color, font size, font face, etc.?
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Hi Experts,

Is there WP plugin that would give backend users more RTF options for posts and pages like font color, font size, font face, etc.?

RTF in WP Admin

WordPress is a free and open-source content management system (CMS) based on PHP and MySQL for creating websites and blogs. Features include a plugin architecture, a template system and strong management, customization and search systems; through its dynamic presentation of content, webmasters have the flexibility to create websites easily.