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<br> is sufficient but in XHTML <br /> is preferred according to the WHATWG and according to the W3C.

To quote Section 8.1.2.1 of HTML 5.2 W3C Recommendation, 14 December 2017

Start tags must have the following format:

...

  1. After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)

    After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)

  2. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

  1. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

<br> is sufficient but in XHTML <br /> is preferred according to the WHATWG and according to the W3C.

To quote Section 8.1.2.1 of HTML 5.2 W3C Recommendation, 14 December 2017

Start tags must have the following format:

...

  1. After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)
  1. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

<br> is sufficient but in XHTML <br /> is preferred according to the WHATWG and according to the W3C.

To quote Section 8.1.2.1 of HTML 5.2 W3C Recommendation, 14 December 2017

Start tags must have the following format:

...

  1. After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)

  2. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

Added links and quotes to specifications backing up the claims made in this Answer.
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Basil Bourque
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<br> is sufficient but in XHTML <br /> is preferredaccording to the WHATWG and according to the W3C.

To quote Section 8.1.2.1 of HTML 5.2 W3C Recommendation, 14 December 2017

Start tags must have the following format:

...

  1. After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)
  1. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

<br> is sufficient but in XHTML <br /> is preferred.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

<br> is sufficient but in XHTML <br /> is preferredaccording to the WHATWG and according to the W3C.

To quote Section 8.1.2.1 of HTML 5.2 W3C Recommendation, 14 December 2017

Start tags must have the following format:

...

  1. After the attributes, or after the tag name if there are no attributes, there may be one or more space characters. (Some attributes are required to be followed by a space. See §8.1.2.3 Attributes below.)
  1. Then, if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

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krupal
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<br> is sufficient but in XHTML <br /> is preferred.

If you use Dreamweaver CS6, then it will autocomplete as <br />.

To validate your HTML file on W3C see : http://validator.w3.org/

lang-html

AltStyle によって変換されたページ (->オリジナル) /