Every time I develop a new form that includes a textarea I have the following dilemma when I need to specify its dimensions:

Use CSS or use the textarea's attributes cols and rows?

What are the pros and cons of each method?

What are the semantics of using these attributes?

How is it usually done?

kogakure

I recommend to use both. Rows and cols are required and useful if the client does not support CSS. But as a designer I overwrite them to get exactly the size I wish.

The recommended way to do it is via an external stylesheet e.g.

textarea {
  width: 300px;
  height: 150px;
}

<textarea> </textarea>

In HTML set

<textarea rows="10"></textarea>

In CSS set

textarea { height: auto; }

This will trigger the browser to set the height of the textarea EXACTLY to the amount of rows plus the paddings around it. Setting the CSS height to an exact amount of pixels leaves arbitrary whitespaces.

According to the w3c, cols and rows are both required attributes for textareas. Rows and Cols are the number of characters that are going to fit in the textarea rather than pixels or some other potentially arbitrary value. Go with the rows/cols.

The answer is "yes". That is, you should use both. Without rows and cols (and there are default values even if you don't use them explicitly) the textarea is unusably small if CSS is disabled or overriden by a user stylesheet. Always keep accessibility concerns in mind. That being said, if your stylesheet is allowed to control the appearance of the textarea, you will generally wind up with something that looks a whole lot better, fits into the overall page design well, and that can resize to keep up with user input (within the limits of good taste, of course).

AsifQadri

The size of a textarea can be specified by the cols and rows attributes, or even better; through CSS' height and width properties. The cols attribute is supported in all major browsers. One main difference is that <TEXTAREA ...> is a container tag: it has a start tag ().

user470962

 <textarea style="width:300px; height:150px;" ></textarea>

I usually don't specify height, but do specify width: ... and rows and cols.

Usually, in my cases, only width and rows are needed, for the textarea to look nice in relation to other elems. (And cols is a fallback if someone doesn't use CSS, as explained in the other answers.)

((Specifying both rows and height feels a little bit like duplicating data I think?))

if you dont use every time use line-height:'..'; property its control the height of textarea and width property for width of textarea.

or you can make use of font-size by following css:

#sbr {
  font-size: 16px;
  line-height:1.4;
  width:100%;
}

For text area we can use below css to fix size

    <textarea  class="form-control" style=" min-width:500px; max-width:100%;min-height:50px;height:100%;width:100%;" ></textarea>

Tested in angularjs and angular7

A major feature of textareas is that they are expandable. On a web page this can result in scroll bars appearing on the text area if the text length overfills the space you set (be that using rows, or be that using CSS. That can be a problem when a user decides to print, particularly with 'printing' to PDF - so set a comfortably large min-height for printed textareas with a conditional CSS rule:

@media print { 
textarea {
min-height: 900px;  
}
}

CSS

input
{
    width: 300px;
    height: 40px;
}

HTML

<textarea rows="4" cols="50">HELLO</textarea>

来源：https://stackoverflow.com/questions/3896537/should-i-size-a-textarea-with-css-width-height-or-html-cols-rows-attributes

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Should I size a textarea with CSS width / height or HTML cols / rows attributes?

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