html - CSS color transition behavior for images with transparent backgrounds -

-



i've noticed unanticipated effect of using css color transitions on image transparent background. here's example:

:root {    --size: 4em;    --duration: 5s;  }  html, body {    margin: 0;    background: slategray;    color: white;  }  .main-menu {    overflow: hidden;    background: black;  }  .main-menu *:hover {    background: skyblue;    -webkit-transition-duration: 5s;    transition-duration: var(--duration);  }  .image-div {    float: right;    padding: calc(var(--size) / 2);    -webkit-transition-duration: 5s;    transition-duration: var(--duration);  }  .image {    max-width: var(--size);  }
<div class="main-menu">    <div class="image-div">      <img class="image" src="https://s4.postimg.org/5zy6kjqcd/maximize.png"/>    </div>  </div>

to summarize, issue this. if hover on image-div div's padding, background color of div , contained image div execute color transition @ same rate, expected. however, if hover on image div, color appears transition faster image-div div's color.

given fact able reproduce exact behavior on firefox, chrome, safari , edge, feeling expected behavior, understand why happening.

when hover on img two hover events triggered - 1 on img , 1 on parent image-div when use * in .main-menu *:hover selector:

instead use hover only on image-div below:

.main-menu .image-div:hover {   background: skyblue; }

and difference in transition not there - see demo below:

html, body {    margin: 0;    background: slategray;    color: white;  }  .main-menu {    overflow: hidden;    background: black;  }  .main-menu .image-div:hover {    background: skyblue;  }  .image-div {    float: right;    padding: calc(4em / 2);    -webkit-transition-duration: 5s;    transition-duration: 5s;  }  .image {    max-width: 4em;  }
<div class="main-menu">    <div class="image-div">      <img class="image" src="https://s4.postimg.org/5zy6kjqcd/maximize.png"/>    </div>  </div>





wiki

Comments

Post a Comment

Popular posts from this blog

python - Read npy file directly from S3 StreamingBody -

-
i have many .npy (numpy) , .json files saved in s3, need download , load these files. for json files downloading files , loading dictionary using following code: obj = s3.object(bucket, key) response = obj.get() body = response['body'].read().decode('utf-8') data = json.loads(body) that way avoid writing .json file disk , reading it. now want same .npy files, equivalent? currently downloading file, saving temp file on disk , loading np.load avoid if possible. following https://stackoverflow.com/a/28196540/3509999 : obj = s3.object(bucket, key) io.bytesio(obj.get()["body"].read()) f: # rewind file f.seek(0) arr = np.load(f) wiki
Read more

kotlin - Out-projected type in generic interface prohibits the use of metod with generic parameter -

-
i start using kotlin , defined interface this: interface aadapter<vh : recyclerview.viewholder> { fun oncreateaviewholder(parent: viewgroup): vh fun onbindaviewholder(v: vh, position: int) } and when try use on code: class klasa ( private val adapter: aadapter<*> ) { fun dosth(){ //... val vh = this.adapter.oncreateaviewholder(parent) //on below line error adapter.onbindaviewholder(v, position) //... } } i error out-projected type 'aadapter<*>' prohibits use of 'public abstract fun onbindaviewholder(v: t, position: int): unit i tied add "in" or "out" definition i'm confused. how allow it. replace aadapter<*> aadapter<recyclerview.viewholder> . class klasa ( private val adapter: aadapter<recyclerview.viewholder> ) { // ... because have declared aadapter has type parameter vh type subclass of recyclerview....
Read more

Asterisk AGI Python Script to Dialplan does not work -

-
i'm stuck project have check database of sip extension incoming caller id , dial sip extension. below receive when run script on asterisk cli. -- registered sip '9125' @ 192.168.1.102:50142 > saved useragent "zoiper rv2.8.40" peer 9125 [2017-08-22 13:53:33] notice[5095]: chan_sip.c:24558 handle_response_peerpoke: peer '9125' reachable. (17ms / 2000ms) == using sip rtp tos bits 184 == using sip rtp cos mark 5 -- executing [0112617769@from-trunk:1] answer("sip/obitrunk1-0000000d", "") in new stack > 0x1ca50d0 -- probation passed - setting rtp source address 192.168.1.98:16834 -- executing [0112617769@from-trunk:2] agi("sip/obitrunk1-0000000d", "test.py") in new stack -- launched agi script /var/lib/asterisk/agi-bin/test.py args: ['/var/lib/asterisk/agi-bin/test.py'] env line: agi_request: test.py env line: agi_channel: sip/obitrunk1-0000000d env line: agi_language: en env line: a...
Read more