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Element.style displays incorrect information

There is simple html and javascript code:

<html>
    <head>
        <style>p { height: 100px;} </style>
        <script>
            window.onload = function(){
                var p = document.getElementsByTagName("p")[0];
                alert("actual height is " + p.style.height);
            };
        </script>
        <title>JavaScript Tests</title>
    </head>
    <body>
        <p>
            100px height p element
        </p>
    </body>
</html>

But when we run it, the actual height is equal to the empty line.
Could you explain why? Thank.

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2 answers

The property styleis different from the actual style in CSS: it is looking for an attribute style, so this is:

<p style="height: 100px"></p>
<script>alert(document.getElementsByTagName("p")[0].style.height);</script>

will be "100px".

To get the actual height, use getComputedStyle().

<style> p { height: 100px; }</style>
<p></p>
<script>alert(getComputedStyle(document.getElementsByTagName("p")[0]).getPropertyValue("height"));</script>
+2
source

The property stylerefers to style attributes that are set explicitly on the element, and not to styles inherited from CSS declarations.

For example, try the following:

<p style="height: 100px;">

. . , .

+2

Source: https://habr.com/ru/post/1779129/

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