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Results: 1578
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Error: The width attribute on the "td" element is obsolete 
width
attribute is removed from td element
by Valeri Tandilashvili
4 years ago
0
HTML
Error
1
Error: The align attribute on the "p" element is obsolete 
align
attribute is removed from 
p
element
by Valeri Tandilashvili
4 years ago
0
HTML
Error
2
Error: An img element must have an "alt" attribute 
Alt
attribute is necessary for element 
img
by Valeri Tandilashvili
4 years ago
0
HTML
Error
2
Error: A slash was not immediately followed by > 
Forward slash
should be immediately followed by angle bracket 
>
. Example tags: 
<br/> , <img/>
by Valeri Tandilashvili
4 years ago
0
HTML
Error
1
Error: No space between attributes
There must be space between attributes
by Valeri Tandilashvili
4 years ago
0
HTML
Error
1
Error: Unclosed element div
Every element should be closed in HTML
by Valeri Tandilashvili
4 years ago
0
HTML
Error
1
Error: Duplicate ID
Several 
id
attributes with the same value is not allowed
by Valeri Tandilashvili
4 years ago
0
HTML
Error
1
::after, ::before, ::first-letter, ::first-line
CSS3 introduced these notations (with two colons) to distinguish pseudo-classes from pseudo-elements. Browsers also accept 
:after
, 
:before
, 
:first-letter
, 
:first-line
, introduced in CSS2
by Valeri Tandilashvili
4 years ago
0
CSS
pseudo-elements
CSS
1
p:first-letter & p:first-line
They were pseudo-classes in CSS2, but in CSS3 they are introduced as pseudo-elements with double colon (
p::first-letter
& 
p::first-line
)
by Valeri Tandilashvili
4 years ago
0
CSS
pseudo-elements
HTML5 and CSS3 beginners tutorials
1
pseudo-element "first-letter"
We can style The first letter of the paragraph differently
p::first-letter {
    color: blue;  
    font-size: 20px;  
    font-weight: bold;  
    background-color: yellow;
}
by Valeri Tandilashvili
4 years ago
0
CSS
pseudo-elements
HTML5 and CSS3 beginners tutorials
1
Results: 1578