The visual editor is the most used component of the WordPress. There are some classes added by WordPress to the visual editor elements to style them. As a theme developer its your responsibility to make sure you have added proper CSS attributes to these classes. Here is the list of classes WordPress automatically adds to the visual editor elements:
.entry-content img {}
.alignleft, img.alignleft {}
.alignright, img.alignright {}
.aligncenter, img.aligncenter {}
.alignnone, img.alignnone {}
.wp-caption {}
.wp-caption img {}
.wp-caption p.wp-caption-text {}
.wp-smiley {}
blockquote.left {}
blockquote.right {}
.gallery dl {}
.gallery dt {}
.gallery dd {}
.gallery dl a {}
.gallery dl img {}
.gallery-caption {}
.size-full {}
.size-large {}
.size-medium {}
.size-thumbnail {}
.alignleft, img.alignleft {}
.alignright, img.alignright {}
.aligncenter, img.aligncenter {}
.alignnone, img.alignnone {}
.wp-caption {}
.wp-caption img {}
.wp-caption p.wp-caption-text {}
.wp-smiley {}
blockquote.left {}
blockquote.right {}
.gallery dl {}
.gallery dt {}
.gallery dd {}
.gallery dl a {}
.gallery dl img {}
.gallery-caption {}
.size-full {}
.size-large {}
.size-medium {}
.size-thumbnail {}
Here is the basic CSS code for these classes. Each Theme should have these or similar styles in its style.css file to be able to display content properly.
.alignnone {
margin: 5px 20px 20px 0;
}
.aligncenter,
div.aligncenter {
display: block;
margin: 5px auto 5px auto;
}
.alignright {
float:right;
margin: 5px 0 20px 20px;
}
.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.alignright {
float: right;
margin: 5px 0 20px 20px;
}
a img.alignnone {
margin: 5px 20px 20px 0;
}
a img.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.aligncenter {
display: block;
margin-left: auto;
margin-right: auto
}
.wp-caption {
background: #fff;
border: 1px solid #f0f0f0;
max-width: 96%; /* Image does not overflow the content area */
padding: 5px 3px 10px;
text-align: center;
}
.wp-caption.alignnone {
margin: 5px 20px 20px 0;
}
.wp-caption.alignleft {
margin: 5px 20px 20px 0;
}
.wp-caption.alignright {
margin: 5px 0 20px 20px;
}
.wp-caption img {
border: 0 none;
height: auto;
margin: 0;
max-width: 98.5%;
padding: 0;
width: auto;
}
.wp-caption p.wp-caption-text {
font-size: 11px;
line-height: 17px;
margin: 0;
padding: 0 4px 5px;
}
/* Text meant only for screen readers. */
.screen-reader-text {
clip: rect(1px, 1px, 1px, 1px);
position: absolute !important;
height: 1px;
width: 1px;
overflow: hidden;
}
.screen-reader-text:focus {
background-color: #f1f1f1;
border-radius: 3px;
box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
clip: auto !important;
color: #21759b;
display: block;
font-size: 14px;
font-size: 0.875rem;
font-weight: bold;
height: auto;
left: 5px;
line-height: normal;
padding: 15px 23px 14px;
text-decoration: none;
top: 5px;
width: auto;
z-index: 100000; /* Above WP toolbar. */
}
margin: 5px 20px 20px 0;
}
.aligncenter,
div.aligncenter {
display: block;
margin: 5px auto 5px auto;
}
.alignright {
float:right;
margin: 5px 0 20px 20px;
}
.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.alignright {
float: right;
margin: 5px 0 20px 20px;
}
a img.alignnone {
margin: 5px 20px 20px 0;
}
a img.alignleft {
float: left;
margin: 5px 20px 20px 0;
}
a img.aligncenter {
display: block;
margin-left: auto;
margin-right: auto
}
.wp-caption {
background: #fff;
border: 1px solid #f0f0f0;
max-width: 96%; /* Image does not overflow the content area */
padding: 5px 3px 10px;
text-align: center;
}
.wp-caption.alignnone {
margin: 5px 20px 20px 0;
}
.wp-caption.alignleft {
margin: 5px 20px 20px 0;
}
.wp-caption.alignright {
margin: 5px 0 20px 20px;
}
.wp-caption img {
border: 0 none;
height: auto;
margin: 0;
max-width: 98.5%;
padding: 0;
width: auto;
}
.wp-caption p.wp-caption-text {
font-size: 11px;
line-height: 17px;
margin: 0;
padding: 0 4px 5px;
}
/* Text meant only for screen readers. */
.screen-reader-text {
clip: rect(1px, 1px, 1px, 1px);
position: absolute !important;
height: 1px;
width: 1px;
overflow: hidden;
}
.screen-reader-text:focus {
background-color: #f1f1f1;
border-radius: 3px;
box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
clip: auto !important;
color: #21759b;
display: block;
font-size: 14px;
font-size: 0.875rem;
font-weight: bold;
height: auto;
left: 5px;
line-height: normal;
padding: 15px 23px 14px;
text-decoration: none;
top: 5px;
width: auto;
z-index: 100000; /* Above WP toolbar. */
}
@narayanprusty
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