How to target first matching descendant? - css

How do we target the first matching descendant, but not all other descendants further down the tree? e.g.,
if the HTML looks like
<div class="wrapper">
<table>
<tbody>
<tr>
<!-- i want to target this td -->
<td>
<table>
<tbody>
<tr>
<!-- but not this one -->
<td>...</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
I've attempted the below, but it doesn't seem to work
.wrapper > table > tbody > tr > td {
...
}

Inherited properties, such as color, would effect the children of the td even if they are not matched by the rule. In this case, 2nd td is a child of the 1st td.
You can reset inherited properties by initial on the children of the matched element. You can also set other properties on any effect children.
Example with color:
.wrapper > table > tbody > tr > td {
color: red;
}
.wrapper > table > tbody > tr > td > * {
color: initial;
}
<div class="wrapper">
<table>
<tbody>
<tr>
<!-- i want to target this td -->
<td>
i want to target this td
<table>
<tbody>
<tr>
<!-- but not this one -->
<td>but not this one</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>

Your css will only target direct td descendants of any direct tr descendants of any direct tbody descendants of any direct table descendants of any .wrapper classed elements.
However, keep in mind that descendants of those tds selected may inherit styles from a parent or at least appear to inherit them.
Below is an example to show that you can style them differently.
.wrapper > table > tbody > tr > td {
background: red;
padding: 4px;
color: white;
}
td {
background: blue;
padding: 10px;
color: yellow;
font-weight: 800;
}
#later-descendant {
background: white;
color: indigo;
padding: 3px;
font-weight: 300;
}
<div class="wrapper">
<table>
<tbody>
<tr>
<!-- i want to target this td -->
<td>
<table>
<tbody>
<tr>
<!-- but not this one -->
<td>yellow</td>
<td id='later-descendant'>indigo</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>

Related

Toggle table cells using pure CSS

Is there any way to toggle (Show / Hide) table column or row with checkbox using CSS no JavaScript?
I've done the following code it does works with div but not with column or row
<label for="trigger">Toggle box</label>
<input id="trigger" type="checkbox">
<div class="box">
Harry I've got Toggled
</div>
<table>
<thead>
<tr>
<th colspan="2">The table header</th>
</tr>
</thead>
<tbody>
<tr >
<td class="box"> I am a column1, I've got same class but sadly did not get toggled! do you know why?</td>
<td> I am a column 2 I don't have any class</td>
</tr>
</tbody>
</table>
<style>
.box {
display: none;
}
#trigger:checked + .box {
display: block;
}
table,
td {
border: 1px solid #333;
}
thead,
tfoot {
background-color: #333;
color: #fff;
}
</style>
How can I toggle table column or row?
your selector is not correct, it should be #trigger:checked ~table .box
look first for a following sibling , then for the child of that sibbling if it stands inside.
.box {
display: none;
}
#trigger:checked ~ .box,
#trigger:checked ~table .box {
display: block;
}
table,
td {
border: 1px solid #333;
}
thead,
tfoot {
background-color: #333;
color: #fff;
}
<label for="trigger">Toggle box</label>
<input id="trigger" type="checkbox">
<div class="box">
Harry I've got Toggled
</div>
<table>
<thead>
<tr>
<th colspan="2">The table header</th>
</tr>
</thead>
<tbody>
<tr >
<td class="box"> I am a column1, I've got same class but sadly did not get toggled! do you know why?</td>
<td> I am a column 2 I don't have any class</td>
</tr>
</tbody>
</table>

:nth-child definition & when it meets tr and caption

with the code below I found I'm confused with the definition of :nth-child
The :nth-child(n) selector matches every element that is the nth child, regardless of type, of its parent.
tr:nth-child(2n) {
background-color: gray;
}
table {
margin-left: 20px;
margin-right: 20px;
border-spacing: 0px;
border: thin solid black;
caption-side: bottom;
border-collapse: collapse;
}
td,
th {
border: thin dotted gray;
padding: 5px;
}
caption {
font-style: italic;
padding-top: 8px;
}
<table>
<caption>content</caption>
<tr>
<th>table head</th>
</tr>
<tr>
<td>111111</td>
</tr>
<tr>
<td>222222</td>
</tr>
<tr>
<td>333333</td>
</tr>
<tr>
<td>444444</td>
</tr>
<tr>
<td>555555</td>
</tr>
<tr>
<td>666666</td>
</tr>
</table>
and the 111111, 333333, 555555 become gray. nothing changed after I delete the caption tag, but 222222, 4444444, 666666 become gray after I removed the tr tag of table title. Isn't :nth-child suppose to count every element of its parent?
The problem here is that your HTML is invalid. tr elements must be wrapped within either a thead, tbody or tfoot element, and most browsers will automatically fix this for you by sticking them in a tbody.
Your HTML on these browsers will actually end up looking like this:
<table>
<caption>...</caption>
<tbody>
<tr>...</tr>
...
</tbody>
</table>
And thus, deleting the <caption> element will have no impact on the positioning of your tr elements.
If you inspect your <table> element, this is what you'll see:

Affect other element's child's style on hover

I could do this with Javascript but I how would I go about achieving this with CSS only:
<table>
<tr>
<td>
Hover me
</td>
</tr>
<tr>
<th id="info">
Info
</th>
</tr>
</table>
All I want is when the anchor link gets hovered on, the table header "info" gets affected. And these are what I've tried to no avail:
a:hover #info
{
text-decoration: underline;
}
a:hover table tr > th#info
{
text-decoration: underline;
}
What did I miss?
You can't do this by selecting the link but you can target the parent tr
This is because there is no parent selector or previous sibling selector
tr:hover + tr th#info {
text-decoration: underline;
background: red;
}
a {
display: inline-block
}
<table>
<tr>
<td>
Hover me
</td>
</tr>
<tr>
<th id="info">
Info
</th>
</tr>
</table>

tableCss style with Nested tables

I am trying to set the first column of the outer table (tbStudentPreference) with special styles...
But the problem is that it applies not only to the outer table column but also to the table inside the outer table.
I want to apply my style only to the outer container table. Please help.
<style>
#tbStudentPreference td:first-child {
font-weight: bold;
vertical-align: top;
width: 100px;
}
#tbStudentPreference {
vertical-align: top;
padding: 3px;
}
</style>
<table id='tbStudentPreference'>
<tr>
<td>xxxxx
</td>
<td>.....
</td>
</tr>
<tr>
<td>xxxxx
</td>
<td>.....
</td>
</tr>
<tr>
<td colspan='2'>
<table>
<tr>
<td>Inside Table
</td>
<td>.....
</td>
</tr>
<tr>
<td>Inside Table
</td>
<td>.....
</td>
</tr>
</table>
</td>
</tr>
</table>
I am trying to set the first column of the outer table..
You need to negate the inner table.
Also, the browser automatically adds a tbody for you, so it is not enough to use a child combinator on tr directly. You need to override that with a child-combinator on tbody. You then negate the inner table by using the presence of colspan attribute.
So, you select td which is a first-child among those which are not having a colspan attribute, direct descendant of tr which itself is a direct descendant of tbody which itself is direct descendant of your table. Like this:
#tbStudentPreference > tbody > tr > td:not([colspan]):first-child {...
The negation pseudo-class: https://developer.mozilla.org/en-US/docs/Web/CSS/:not
Snippet:
#tbStudentPreference { border: 1px solid gray; border-collapse: collapse; }
#tbStudentPreference td { border: 1px solid gray; }
#tbStudentPreference > tr > td:not([colspan]):first-child {
font-weight: bold; color: red;
}
#tbStudentPreference > tbody > tr > td:not([colspan]):first-child {
font-weight: bold; color: red;
}
<table id='tbStudentPreference'>
<tr><td>xxxxx</td><td>.....</td></tr>
<tr><td>xxxxx</td><td>.....</td></tr>
<tr><td colspan='2'>
<table>
<tr><td>Inside Table</td><td>.....</td></tr>
<tr><td>Inside Table</td><td>.....</td></tr>
</table>
</td></tr>
</table>

Selecting first td in the first table with CSS 3

Say for example I have:
<div id="container">
<table>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</table>
<table>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
</table>
</div>
And
td { width:10px; height:10px; }
What I want to do is apply a style to the first td, of the first table.
I would have expected:
#container table:first-child td:first-child {
background: red;
}
However it does not work? Please advise!
#container table:first-child tr:first-child td:first-child { background: red; }
Seems to work.
Note that under IE, you will need to have a !DOCTYPE declaration in your html to get support for :first-child. http://www.w3schools.com/cssref/sel_firstchild.asp
To select only the first table within the div:
div#container table:nth-child(1) tr td {
color: #888;
}
To select only the first td of the first table within the div:
div#container table:nth-child(1) tr td:nth-child(1) {
color: #444;
}
For me this works easier if you want to change it to a second table or second tablecell
div#container table:nth-child(2) tr:nth-child(4) td:nth-child(1) {
color: #888;
}

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